Roy Halladay spent the final four seasons of his career with the Philadelphia Phillies, proving during that stretch that he still had plenty left in the tank. And in one of those seasons, he left behind a record that has stood untouched for 15 years.

Though Halladay is no longer with us, his legacy on the mound lives on—not just with Phillies fans, but also in Toronto, where he made history with the Blue Jays, including his 22 wins during the 2003 season.

With the Phillies, his numbers were strong across the board, but it was his first year in 2010 that truly stood out. Halladay racked up more than 20 wins and helped lead the team to the best regular-season record in Major League Baseball.

What’s the record that remains untouched 15 years later?

Halladay’s 21-win season in 2010 remains

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