27. Ray Kremer

The history of baseball is filled with young prospects showing quick, elite talent by age twenty, but Ray Kremer's journey to major league fame was quite different. He spent nearly ten years working his way through the minor leagues and didn't pitch in the majors until he was 28. Kremer brought a mature, strategic approach to the mound, outsmarting hitters during the high-scoring 1920s. With smooth, reliable delivery, he spent his entire 10-season career in Pittsburgh, becoming a model of efficiency and the star of a small dynasty.

His debut campaign in 1924 immediately demonstrated his reliability. At just 28, rookie Kremer made pitching a consistent part of the season, finishing with an impressive 18–10 record and a flawless 3.19 ERA in 31 starts. This solid foundation paved the way for a remarkable peak, during which he played a crucial role in leading the team through some of the most intense pennant races of the decade.

During the historic 1925 campaign, his unwavering control helped the Pirates win the National League pennant. This laid the foundation for his exceptional performance in the Fall Classic, where he achieved two crucial wins against Washington, securing the World Series.

Over the next two summers, Kremer continued to excel. In 1926, he delivered an exceptional performance, showcasing excellent control to win his first National League ERA title with a tiny 2.61, and achieving a career-high 20 wins, finishing third in the National League MVP voting. He built on that success in 1927 by defending his ERA title during the pennant race, leading all of Major League Baseball with a 2.47 ERA, finishing in the top ten in MVP voting again, and helping the Bucs return to the World Series.

Even as the league's offensive surge peaked at the start of the decade, Kremer continued to be a leading winner. In the 1930 season, he leveraged his notable durability to lead the National League in wins for the second time, finishing with an impressive 20–12 record over 276 innings pitched.

Tragically, after extensive physical effort at an advanced age, natural decline caught up with him quickly by early 1931. His usual efficiency declined, and by the summer of 1933, he was no longer a major league contributor. He retired from the sport after the 1933 season, leaving behind a remarkable record: 143 wins and 85 losses, a solid 3.76 ERA, 140 complete games, and 233 appearances, all in a black-and-gold uniform.