A quick glance at Johan Santana’s Baseball-Refernce page should outline all you need to know about how great of a pitcher he was.
A career 3.20 ERA (136 ERA+) in just a hair over 2,000 innings pitched (2,025.2), Santana won 2 Cy Young Awards while a member of the Minnesota Twins. Joining the Mets in 2008, Santana would go on to win the NL ERA title, finishing the year with a career-best 2.53 mark, proving he could get it done regardless of leagues.
Suffice to say, the left-hander who wowed hitters with an excellent circle change-up, was simply phenomenal.