Tino Martinez was an excellent college baseball player at the University of Tampa and a Gold Medalist at the Seoul Olympics.  Martinez was a first round pick (14^th Overall) in 1988, and he would debut with Seattle in 1990. 

Ken Phelps never really got the chance to be an everyday player in his career, mostly used in platooning situations, but that makes his days in baseball sound so basic. 

Dave Valle made his Major League debut in 1984 with the Seattle Mariners, and he would play for the M's infrequently over the next three seasons before he would play the lion's share at Catcher in 1987.    

The fact that Leon Roberts had a Major League career at all was impressive, considering that he withheld poor vision from his teammates and management.  Regardless, he fought for a spot in Baseball, and his best years happened in Seattle.

After being drafted in the 12^th Round of the 1997 Draft, Joel Pineiro would reach the majors in 2000, and made it to the Mariners starting rotation in 2002. 

Tom Paciorek made his debut in the Majors in 1970 with the Los Angeles Dodgers, and he saw little action with L.A. when he played there until 1975.  The Atlanta Braves had him next but released him in May of 1978, and by that time, he was 30 and had never been more than a platoon player.  The Mariners would sign him days later, and the First Baseman remained as a platoon player, but he would see more action in 1980 and would have 114 Hits.  That was good, but in 1981, he had an unexpected season.

After playing a decade in Japan with Yokohama, Kazuhiro Sasaki was a 32-year old rookie in Seattle, and with a decade of real experience, he easily won the 2000 American League Rookie of the Year Award.  The former Central League MVP would finish third in the AL with 37 Saves.

From Canada, James Paxton was a fourth round pick who would play collegiately at the University of Kentucky.  Paxton debuted in 2013 and had four starts, winning three of them.  Over the next three seasons, Paxton was often on the disabled list, and he had a pedestrian 15-15 record, but by 2017, he was healthy and was able to show what he could do.

Omar Vizquel is not primarily associated with the Seattle Mariners, but the player who would become one of the best defensive infielders ever would begin his career in the Pacific Northwest.

After four years in the Majors,  Brice Bochte would sign with the Seattle Mariners as a Free Agent and went on to have the best run of his career.  

Carlos Guillen's career took off with the Detroit Tigers, but his Major League career began in Seattle.

Franklin Gutierrez was not a superstar in the Majors, but his best years by far were his time in Seattle.

Jeff Nelson was with the Seattle Mariners for three different runs, and while he was a four-time World Series Champion with the New York Yankees, it is with Seattle where he will always be most associated with.

Before Phil Bradley became an accomplished major-league outfielder, he was already a notable athlete in the Midwest. At the University of Missouri, he excelled as an All-American outfielder and simultaneously was a three-time Big Eight Offensive Player of the Year as a quarterback. After being picked in the third round of the 1981 amateur draft by the Seattle Mariners, he quickly developed his exceptional hand-eye coordination in the minors. By 1983, he had made it to the big leagues, bringing energetic athleticism to a young team eager for talented table-setters.

Bradley’s breakout came during the historic 1985 season, a summer when he produced one of the most explosive individual performances for the franchise that decade. As the team's regular left fielder, his quick wrists and disciplined hitting overwhelmed opposing pitchers. He hit an impressive .300, ranking seventh in the American League, and achieved career highs with 192 hits, 33 doubles, 26 home runs, and 88 RBIs. His standout season included a dramatic walk-off grand slam against the Minnesota Twins on April 13, which led to his first All-Star selection and a 16th-place finish in the AL MVP voting.

He demonstrated how his exceptional performance in the 1986 season relied on selective patience rather than raw power. While his home runs remained steady at 12, Bradley improved his batting average to an impressive .310, placing him eighth in the league. His disciplined approach made him a difficult matchup, drawing 77 walks and achieving a stellar .405 on-base percentage, which ranked among the top ten. Coupled with his 21 stolen bases, he consistently created scoring chances at the top of the order.

In 1987, Bradley had a highly productive summer in the Pacific Northwest, hitting .297 with 14 home runs, 38 doubles, and 101 runs scored. He also showcased his speed by stealing 40 bases, a career high. Despite his popularity and efficiency, the team traded him to the Philadelphia Phillies in December 1987 for a package that included utility player Mike Jackson and outfielder Glenn Wilson. While he continued to perform well with the Phillies, Orioles, and White Sox, Bradley’s prime physically was spent entirely in Seattle.

Bradley compiled 52 home runs, 107 stolen bases, and an exceptional .301/.382/.449 slash line across 607 games in Seattle.

In terms of infield defensive versatility, Jose Lopez is right at the top of the list for the Seattle Mariners.

J.J. Putz made his Major League debut with the Seattle Mariners in 2003 for three games, and in 2004 and 2005, he had a role in the bullpen appearing in 118 Games.  In those two years, Putz was just another arm, but after adding a splitter to his arsenal, and winning the closing job, 2006 would see him reborn.

When the Seattle Mariners began their first season in April 1977, they were a diverse team still searching for key players to build a future. Julio Cruz came into the picture. Initially signed from the California Angels' farm system, the smooth-fielding switch-hitter was picked by Seattle in the 1976 expansion draft. He gained immediate experience in the majors as a 22-year-old rookie that summer, and the next year, he became the franchise's first regular starting second baseman.

Known affectionately as "The Cruzer" by a growing Pacific Northwest fan base, his value wasn't based on raw power or extra-base hits. Cruz epitomized the dead-ball style speedster of the late 1970s; during his six-and-a-half seasons in Seattle, he was a light hitter with only 17 home runs and a modest .243/.327/307 slash line. Nonetheless, he had exceptional base-running instincts and an innate talent for causing chaos once he reached first base.

Cruz used his lightning-fast speed to solidify himself as the anchor of manager Darrell Johnson’s lineup, constantly challenging opposing catchers with aggressive baserunning. His performance peaked in the 1978 Season, when he raced across the Kingdome’s artificial turf to steal a career-high 59 bases. This breakout established him as an elite baserunner, and he consistently surpassed 40 stolen bases each year for the following four seasons, regularly creating scoring opportunities for a team in need of offensive stability.

Beyond his peak in dynamic base-running, Cruz offered consistent, highly efficient infield play. His soft hands and excellent lateral range contributed to his strong relationship with teammates around second base, making him a beloved clubhouse leader during the team's early years. The end of his notable tenure in Seattle came in June 1983, when the front office traded him to the Chicago White Sox in exchange for infielder Tony Bernazard. Cruz quickly found success in Chicago, becoming a key player that helped the White Sox achieve a 99-win season and win the American League West division.

He finished his Seattle career with 701 hits and 290 stolen bases in 722 games. He held the franchise record for stolen bases for 25 years until Ichiro Suzuki surpassed him in 2008.

Jim Beattie came to the Pacific Northwest with credentials that few of his new teammates could rival. An Ivy League star from Dartmouth, this tall 6-foot-5 right-hander had already achieved baseball's highest honor as a rookie in 1978 by starting and winning Game 5 of the World Series for the New York Yankees. But the intense New York environment changed quickly, and after just two winters, Beattie was traded to the expansion Seattle Mariners in a multi-player deal. He went from the high-pressure spotlight of New York to the challenges of a franchise seeking its identity, moving from a playoff contender to the bottom of the American League.

His initial time on the Kingdome turf was a tough baptism, marked by misfortune and little local support. Beattie faced a difficult 1980 debut, ending with a 5–15 record and a 4.85 ERA. After a similarly tough start in 1981, which included a brief demotion to Triple-A Spokane, he returned to the major leagues with a completely revised approach. Despite continuing to post losing records—a common outcome for a team that often finished last in the division—Beattie quietly became a reliable, intelligent mainstay of the starting rotation.

His major breakthrough as a key pitcher came in a remarkable 1982 season. Over 26 starts, Beattie posted a strong 3.34 ERA, ranking seventh in the American League, and his 140 strikeouts placed him eighth in the league. He combined impressive swing-and-miss ability with effective efficiency, becoming a star attraction for local fans who saw that his talent greatly surpassed his misleading 8–12 record.

That durability reached its peak during the crucial summers of 1983 and 1984. On September 27, 1983, Beattie achieved a historic milestone by pitching a one-hit shutout against the Kansas City Royals—the first in franchise history. He continued with a heavy workload in 1984, pitching 211 innings and completing 12 games. His consistent ability to go deep into games and keep his bullpen fresh earned him top-ten bWAR rankings among American League pitchers in both years, exemplifying a model of stable and focused performance.

After a sharp decline over two injury-plagued winters, Beattie threw his final major league pitch in August 1986. He left with a 43–72 record, 24 complete games, and 563 strikeouts over 944.1 innings.

When Mitch Haniger arrived in the Pacific Northwest in November 2016, it seemed like just another typical roster adjustment. The Seattle Mariners’ general manager, Jerry Dipoto, traded shortstop Jean Segura to the Arizona Diamondbacks in a five-player deal. However, it was Haniger—a former promising outfield prospect who had difficulty securing regular playing time in Arizona—who proved to have the greatest potential. After being named the starting right fielder at Safeco Field, the determined outfielder quickly took advantage of his new role, turning his powerful swing into a key asset for the team.

His outstanding breakout came during the historic 2018 season, a summer when Haniger played at a top-tier superstar level. He established himself as a relentless offensive threat and the emotional leader of manager Scott Servais' team, hitting against opposing pitchers with a .285 average, 170 hits, 38 doubles, 26 home runs, and 93 RBIs. His ability to consistently deliver clutch, high-pressure hits earned him his first selection to the American League All-Star Game and an impressive 11th-place finish in MVP voting. Defensively, he showcased a powerful throwing arm, leading the majors with 12 outfield assists and cementing his status as one of the best right fielders in the league.

Haniger was expected to lead the organization through a transitional youth movement, but his rapid rise was tragically halted by a series of severe and painful injuries. In June 2019, he was struck by a sharp fastball that ruptured his testicle, leading to a difficult chain of core muscle tears and back surgeries. These intense physical issues sidelined him for the rest of 2019 and caused him to miss the entire 2020 season, which was shortened by the pandemic. This two-year gap posed a serious threat to his playing career.

Haniger demonstrated his remarkable mental resilience with an impressive comeback in the unforgettable 2021 season. Although his batting average fell to .253 and he became more prone to strikes, his power surged to new heights. Leading as a seasoned veteran on a young team that reached deep into September, he set personal records with a team-leading 39 home runs and 100 RBIs. His successful return won over local fans and earned him a spot in the top 20 of the American League MVP race, confirming the success of his lengthy physical rehab.

After an ankle injury limited his 2022 season to 57 games, Haniger provided veteran leadership to help Seattle end a 21-year playoff drought. He then signed a lucrative free-agent deal with the Giants. In 651 games in a Mariners uniform, he amassed 619 hits, 119 home runs, and a. 786 OPS.

When learning that his son (erroneously) was dead from George Steinbrenner, Frank Costanza’s first response on Seinfeld was:

“What the hell did you trade Jay Buhner for? He had 30 Home Runs, over 100 RBIs last year! He’s got a rocket for an arm! You don’t know what the hell you’re doing!”

How could we not open with this?

Frank Costanza was entirely right. The infamous July 1988 trade that sent Jay Campbell Buhner from the Bronx to the Pacific Northwest in exchange for Ken Phelps—who was out of baseball just two years later—stands as one of the most lopsided structural blunders in modern baseball history. Arriving in Seattle with a fierce, unadulterated competitive edge, the man affectionately known as "Bone" completely transformed his professional identity. Across a celebrated 14-year residency, the charismatic slugger became the raw, emotional heartbeat, the ultimate clubhouse enforcer, and the definitive power anchor of the most iconic era in franchise lore.

His initial period in Seattle did not produce immediate, rapid muscle growth, as he adapted to the demands of major league pitching on a daily basis. The pivotal breakthrough occurred in the 1991 season, when he surpassed the 20-home-run mark for the first time. Buhner consistently engaged in deep counts, turning this approach into a disciplined daily routine, and maintained or exceeded the 20-homer threshold for four consecutive summers. During this time, he established himself as an essential protective presence in the batting lineup for a young Ken Griffey Jr.

The peak of his hardware-certified legacy in evolution unfolded over an impressive three-year period from 1995 to 1997. He systematically dismantled American League pitching during the historic 1995 regular season, hitting 40 home runs and producing 121 RBIs with a commendable .566 slugging percentage, thereby securing a remarkable fifth-place position in the American League Most Valuable Player voting.

He carried that high-leverage devastation directly into the 1995 postseason, smashing another four home runs during the club's legendary "Refuse to Lose" playoff run that saved baseball in Seattle. He followed that up by unleashing even greater raw power during the 1996 schedule, hammering a career-high 44 home runs and driving in a monster 138 runs, before launching another 40 long balls with 109 RBIs in 1997.

The primary area where Buhner encountered substantial challenges under rigorous analytical scrutiny was his high-volume volatility. He was an extraordinarily effortful hitter who twice led the American League in strikeouts, returning to the dugout a remarkable 1,406 times while playing for the Mariners. Defensively, although Frank Costanza was entirely correct regarding his exceptionally strong throwing arm, Buhner displayed limited speed and lateral agility, frequently recording a defensive bWAR with negative values. Notably, during the summer of 1996, when he received his sole Gold Glove Award, he concluded that season with a -0.7 dWAR, demonstrating that his renowned throwing ability often concealed his underlying defensive metrics.

Trying to measure Buhner's legacy only through cold analysis really overlooks why he's such a beloved figure in our local culture. With his iconic shaved head and goatee—a look that was pretty unique in the sport back then—he shared a genuine, mutual love with the fans. The front office beautifully tapped into this natural fan enthusiasm by creating "Buhner Buzz Cut Night," a popular event where thousands of fans got free tickets to the Kingdome just for letting team barbers shave their heads—highlighting the strong connection between him and the community.

Following a series of severe hamstring and knee ailments late in his career, a definitive exit arrived when Buhner retired at the conclusion of the historic 104-win 2001 regular season. He departed from the field, leaving behind a formidable statistical legacy predominantly concentrated in the upper-left region of the map: a robust .494 slugging percentage, 951 hits, and exactly 307 home runs—a total that still ranks third in franchise history behind only Griffey and Edgar Martínez. Buhner retired in 2001, having amassed notable statistics including 307 home runs and a .497 slugging percentage. The Mariners honored the esteemed player by inducting him into their Hall of Fame in 2004.