14. Roger Clemens

When Roger Clemens signed a lucrative free-agent deal with the Toronto Blue Jays in December 1996, many in baseball doubted the move. Boston general manager Dan Duquette had notably said the ace was nearing the end of his career, allowing the 13-year Red Sox legend to leave after two seasons that hinted his top skills were fading. Determined to disprove his former team, the fiercely competitive pitcher moved north of the border and delivered an extraordinary period of dominance, recording one of the most statistically impressive consecutive pitching performances in Major League Baseball history.

Although modern sports history tends to overlook his short two-season stint with the Blue Jays—and while concerns about performance-enhancing drugs would later cast a shadow on his career—his performance in that uniform marked a remarkable return to his absolute peak.

During the 1997 and 1998 seasons at SkyDome, "The Rocket" transformed his pitching approach, combining a revitalized mid-90s fastball with a deadly, untouchable split-finger fastball. He dominated American League hitters, winning the pitching Triple Crown in both years by leading in wins, strikeouts, and ERA each summer. He earned the AL Cy Young Award twice, leading the league in ERA+ and FIP throughout his tenure and also leading in WHIP during his groundbreaking 1997 debut. No pitcher in Toronto's history, before or since, has achieved such consistent individual dominance.

Every fifth day, Clemens turned a struggling Toronto team into a top-tier competitor, posting a remarkable 41–13 record and recording 563 strikeouts. However, despite his exceptional talent on the mound, the Blue Jays lacked sufficient roster depth to back him up. The team hovered around an equal number of wins and losses, rendering them non-competitive in the fiercely contested AL East pennant race, which was led by his former team and the rising powerhouse in New York.

Realizing his chance to win another World Series ring was slipping away, Clemens asked for a trade to a strong contender after his second consecutive Cy Young Award in 1998. The front office responded in February 1999 by making a major trade, sending Clemens to the New York Yankees in exchange for David Wells, Graeme Lloyd, and Homer Bush.

Because his time in Ontario was compressed into just two summers, his name doesn't sit near the top of the organization's multi-decade career volume leaderboards. Yet, generating an astronomical 20.1 total bWAR in just 67 starts, his blistering, award-winning peak gave Toronto baseball a concentrated injection of historic pitching excellence that remains permanently unmatched. With Toronto, he posted an impressive 41–13 record, a tiny 2.33 ERA, and a 1.06 WHIP. He pitched 508.2 innings, including 20 complete games, five shutouts, and 563 strikeouts.