Cy Young won 511 games during his career, more than any other pitcher in major-league baseball. But he lost 315 games, which is also more than any other pitcher in the major leagues.
From The Giant Book of More Strange But True Sports Stories by Howard Liss. Illustrations by Joe Mathieu.
does that mean he basically played more games than any major league pitcher?
Probably, because back then pitchers threw in way more games per season than they do now. Which means that, barring someone playing as a starter over the course of 30 years (which is highly unlikely), there’s no way anyone is going to top either his win or loss records, which still stand today.