Corcoran debuted in 1880 and bypassed the usual maturation process, maturing instantly into the most feared right-hander (and occasional left-hander) in the National League. He was the definition of a workhorse for a White Stockings club that terrorized the league during the early 1880s. Between 1880 and 1884, Corcoran amassed a staggering 170 wins, a total that speaks to a level of durability that is almost incomprehensible by modern standards. He relied on a rare, "switch-pitching" ability that allowed him to alternate arms to combat fatigue or exploit a hitter's weakness, a tactical outlier in an era of iron-man rotations.

The absolute pinnacle of his career arrived in 1882, a season in which he stood as the undisputed king of the mound. Corcoran was an efficiency machine that summer, capturing the National League ERA title and leading the circuit in WHIP and hits per nine innings. Most notably, he made history by becoming the first pitcher in the history of the sport to throw a second career no-hitter. He wasn't just piling up wins; he was suppressing runs at a rate that made him a statistical titan, serving as the cornerstone for a championship-caliber roster.

His identity was synonymous with the high-stakes, high-workload environment of the early professional game. Corcoran was a master of the "Deadball" tactical battle, using his unique arm flexibility to navigate the grueling schedules of the 1880s. However, the sheer volume of his production eventually demanded a toll. By 1885, the arm that had carried the franchise to multiple titles was effectively "dead," the victim of a workload that saw him average nearly 400 innings a season during his prime. Whether he was baffling hitters with a side-arm curve or making history with his second no-no, he played with a focused intensity that made him a local immortal.

The chapter reached a sudden and quiet conclusion in 1887, just two years after his effectiveness vanished.

A trade with the Cardinals in 1933 brought the Louisiana right-hander to Chicago, and he wasted no time maturing into a cornerstone of the staff. Lee quickly shed any "prospect" labels by establishing a baseline that the North Side hadn't seen in years. From 1935 to 1939, he was a metronome of productivity, rattling off four separate seasons with at least 18 wins. He arrived as a young arm with a "jug-handle" curve and immediately became the stabilizing force for a roster that captured the 1935 pennant behind a historic 21-game winning streak.

The absolute pinnacle of his residency arrived in 1938, a season so profound that he was the consensus choice for the best pitcher in the game. That year, Lee led the National League in wins (22), ERA (2.66), shutouts (9), and ERA+ (144). and 8.0 bWAR—the highest for any pitcher in the league, and a second-place finish in the MVP voting. He was the primary architect of the "Homer in the Gloamin'" pennant race, at one point hurling four consecutive shutouts to tie a league record and drag the Cubs back into the thick of the race.

Consistency remained his trademark even as the decade turned. Lee was a two-time All-Star who was a quiet, durable workhorse. He was the rare pitcher who could bridge the gap between high-volume innings and elite run suppression, ultimately winning 139 games in a Cubs uniform, a total that still ranks among the top ten in the long history of the organization. Whether he was saving games in the 1935 World Series or leading the league in starts, he was the arm the organization leaned on when the stakes were highest.

The final chapters of his Chicago story were written during a brief return in 1947, following stints in Philadelphia and Boston. He left the city as a beloved figure of the pre-war era, a man whose 1938 campaign remains one of the most statistically perfect seasons in the annals of Wrigley Field.

Chicago’s offense in the 1880s operated with a swagger that began and ended with the man they called "The King." Kelly brought a cerebral, almost mischievous quality to the plate, maturing into a hitter who understood how to manipulate the rules and the opposition to his advantage. His tenure reached a historic peak in 1884 and again in 1886, seasons of undeniable dominance where he captured the National League batting title and led the circuit in on-base percentage. He wasn't just a contact hitter; he was a run-scoring machine who led the league in that category three times, finishing his Chicago stay with a robust .316 average.

The weight of his Chicago stint was measured in pennants. With Kelly anchoring the lineup and the clubhouse, the White Stockings captured five championships, a run of success that many historians believe would have been impossible without his innovative baserunning and situational hitting. He was a two-time leader in doubles, proving he could drive the ball into the gaps of the early parks with ease. He arrived as a versatile talent and quickly became the emotional heartbeat of a city that was falling in love with the game, famously inspiring the hit song "Slide, Kelly, Slide."

Despite his massive popularity and production, the organization shocked the baseball world following the 1886 campaign by selling his contract to the Boston Beaneaters for the then-unheard-of sum of $10,000. This "$10,000 Beauty" trademarked the conclusion of his Chicago chapter, though his impact on the franchise's record books remained indelible. He left the city as a folk hero, a man who had proven that personality and performance could combine to create a legitimate cultural icon.

Recognition for his status as a pioneer of the professional game arrived in 1945, when the Old Timers’ Committee elected him to the Baseball Hall of Fame. Decades later, the Cubs solidified his place in the pantheon of North Side greats by naming him an inaugural member of the team Hall of Fame in 2021. He remains the gold standard for the "showman" archetype, a player who showed that you could be the most entertaining man on the field while simultaneously being the most dangerous.

Wrigley Field in the early 1950s was often a place of individual brilliance set against a backdrop of collective struggle, and no player embodied that reality more than Rush. He surfaced as the undisputed ace of a staff that desperately needed a stabilizing force, maturing into a threat despite a lack of run support. His career record of 110-140 is a classic example of how a box score can mask true value; a deeper look at his advanced stats reveals a pitcher who finished in the top ten in bWAR for pitchers four different times during his Chicago residency.

The peak of his efficiency was marked by a relentless ability to miss bats. Rush was a strikeout artist in a decade when contact was king, ranking among the league's top 10 in punchouts four times. He surpassed the 1,000-strikeout milestone in a Cubs uniform, finishing with 1,076 and earning two All-Star selections as a testament to the respect he commanded from his peers. He brought a workhorse approach to every start, frequently leading the team in innings pitched and complete games, serving as the rare player who could keep the North Side competitive on any given afternoon.

Rush was defined by a quiet, professional resilience. He never complained about the lack of offensive help; he simply took the ball every fourth day and provided a level of stability that stood out as a beacon of quality in the 1950s. Whether he was baffling hitters with his hard stuff or laboring through a deep count to secure a victory, he was the gold standard for Cubs pitching for a decade. He proved that greatness isn't always reflected in a winning percentage, but in the consistency of the effort and the quality of the stuff.

The final chapter of his Chicago tenure came in 1957, when he was traded to the Milwaukee Braves. He left the city as one of the most respected right-handers of his generation, a man who had authored a statistical resume that stood up to the scrutiny of the most advanced modern metrics.