We have to go way back for this one, as Buck Ewing joined the Giants in 1883, after 

A player with multiple defensive skills (he played at Catcher, Outfield, Second, and Third), Ewing began his career in the National League with Troy, where he played three seasons before the team folded, and he joined New York, the team where he became a star.  Along with his defensive versatility (though he was at his best as a Catcher), Ewing was a competent hitter, batting over .300 in six of his first seven years with New York.  

19^th Century Baseball was not a power game, but Triples and Stolen Bases were in vogue, and Ewing could deliver.  He was the league leader in Triples with 20 in 1894 and had 109 in total as a Giant.  Ewing stole 178 bases on the base paths for New York, an astonishing number for a Catcher.  Ewing was also a large part of the original version of the World Series, leading New York to titles in 1888 and 1889.  

After 1989, Ewing was one of many players who jumped to the Players League, but with that organization lasting only one year, he was back to the Giants, playing there three more years before he was traded to Cleveland.

In 1939 Ewing was elected into the Baseball Hall of Fame by the Old Timers Committee.  

The story of the New York Giants in the 1930s is mainly centered on the legendary 'King Carl' Hubbell. However, the team's quick rise to becoming a strong National League contender was largely thanks to a dependable second pitcher. Signed in 1931 from St. Lawrence University by scout Art Devlin, with the condition that he could finish his degree, Harold ‘Prince Hal’ Schumacher brought a smart, businesslike attitude to manager John McGraw’s pitching staff. By the time Bill Terry became the manager, Schumacher was well-placed to serve as a powerful right-handed complement to Hubbell's left-handed skills, holding the second spot in the rotation as the team grew into a championship contender.

Schumacher’s breakthrough came during the notable 1933 season, a summer when he played at a top, frontline level. He ignited with a remarkable 19–12 record, a stellar 2.16 ERA, and leading the National League by allowing just 6.9 hits per nine innings. He carried this top form into the Fall Classic against the Washington Senators, delivering a brilliant five-hit complete game in Game 2 and driving in three runs. He also started the exciting, extra-inning Game 5 final, earning his only World Series ring and a spot in the first-ever 1933 Major League Baseball All-Star Game.

In his remarkable 1934 season, he reached new heights in the regular season, establishing himself as a dependable workhorse. He made a career-high 36 starts and pitched 297 innings, leading the team with 23 wins and only 10 losses. Beyond his pitching prowess, he was a versatile player, hitting six home runs and helping the Giants navigate a tough pennant race. His durability and reliability impressed national writers, earning him a ninth-place spot in the National League MVP voting.

Schumacher earned a second All-Star selection in 1935 after another strong 19–9 season. However, the demanding workload of nearly 940 innings before age 25 began taking a toll. After this intense peak, he became a reliable, middle-of-the-road starting pitcher for the rest of his career. Although he no longer reached 15 wins or matched his early statistical outliers, he remained a dependable player who consistently ate innings and helped keep a competitive New York team afloat in the standings.

His long-standing tenure with the club ended suddenly after the 1942 season, as a larger global conflict overshadowed baseball. Instead of remaining in the Giants' rotation, Schumacher prioritized his duty and joined the United States Navy to serve in World War II. He missed three key seasons, from 1943 to 1945, while serving honorably in the Pacific Theater as a lieutenant on the escort aircraft carrier USS Cape Esperance. He returned safely to Manhattan for a brief, final appearance in 1946, winning two complete games early in the summer before retiring from baseball at age 35.

Schumacher retired having spent his entire 13-year major league career exclusively in a New York Giants uniform, compiling a highly successful 158–121 record, 906 strikeouts, and a sharp 3.36 ERA across 391 appearances.

Art Fletcher is thought of more by baseball pundits for his time as a Coach for the New York Yankees, but as a player, he is arguably the greatest defensive player in Giants history.

Holding the franchise record for Defensive bWAR (25.9) and a three-time league leader in that stat, Fletcher was also first in Assists four times.  Offensively, Fletcher was no star, but he accumulated 1,311 hits, batted .275 for New York, and mastered the selfless art of being hit by pitches, leading the NL in that statistic four times.

The Giants made the World Series (though lost) with Fletcher as their Shortstop four times.  You have to be a pretty good ballplayer to be a starting Shortstop for that to happen.

Standing at just 5'11" and weighing 170 pounds, Tim Lincecum appeared more like a finesse pitcher with light throws than a dominant power arm. However, the San Francisco Giants saw exceptional talent, choosing him with the tenth overall pick in the 2006 draft, recognizing him as a Golden Spikes Award winner. His delivery was explosive and high-leverage, with a large stride and vigorous hip rotation. After only one summer in the minors, he burst into the major leagues, earning the nickname "The Freak.” His rise sparked a peak of dominance that reshaped the franchise's identity.

Debuting in 2007, Lincecum emerged prominently the subsequent year. He established a routine of overpowering elite batters with 98 mph fastballs and executing a formidable, tumbling split-changeup. He methodically dismantled National League lineups, concluding the season with an impressive 18–5 record and a 2.62 ERA. That summer, he captured his very first career National League Cy Young Award while pacing the senior circuit in strikeouts (265), FIP (2.62), hits per nine innings (7.2), and strikeouts per nine innings (10.5).

Far from a transient anomaly within a single season, he advanced into an exceptionally exclusive neighborhood by securing a consecutive Cy Young Award in 2009. He demonstrated an exemplary performance in run prevention, concluding the season with a record of 15–7 and a career-best 2.48 ERA, while also leading Major League Baseball with an exceptional 2.34 FIP and accumulating a league-high total of 261 strikeouts over 225.1 innings.

His collective peak reached its absolute emotional pinnacle during the remarkable autumn of 2010. Following his attainment of a third consecutive All-Star selection and a third consecutive strikeout title during the regular season, Lincecum served as the primary postseason ace. He notably outperformed Roy Halladay in the National League Championship Series before decisively defeating the Texas Rangers in the World Series, securing two victories—including an outstanding performance with eight strikeouts in the decisive Game 5—and thereby capturing the franchise's first World Series championship since relocating to San Francisco.

To provide an equitable assessment, it is necessary to acknowledge the abrupt physical deterioration that ultimately disrupted his journey to Cooperstown. His distinctive, torque-intensive mechanics exerted considerable strain on his lower extremities, causing his exceptional physical leverage to vanish with startling rapidity. After a final All-Star appearance in 2011, his statistics commenced a decline over successive summers, attributable to persistent hip and shoulder problems.

Although his days as a frontline starter were over, his competitive drive remained essential to the ongoing dynasty; he seamlessly transitioned to a high-leverage relief role during the 2012 postseason, pitching 13.0 exemplary innings out of the bullpen to assist in securing a second championship ring.

Though his active participation was minimal during the 2014 world title run and his career officially fizzled out following a brief cameo with the Los Angeles Angels in 2016, his short-term peak remains completely unassailable.

Lincecum walked away from the Bay Area mound, leaving behind a highly concentrated statistical foundation that tells the story of a shooting star. Across his nine seasons strictly representing San Francisco, he compiled a 108–89 record alongside 1,704 strikeouts and a 3.61 ERA over 1,643.2 innings of work.  He remains the only two-time Cy Young winner in franchise history.