The 15 Best Relief Pitchers in the Last 15 MLB Seasons

7. Rafael Betancourt

WAR: 15.0

RA9-WAR: 13.6; RAR: 145.9

FDP-Wins: -1.4; BIP-Wins: 0.9; LOB-Wins: -2.3

Rafael Betancourt isn't a name we often think of as it pertains to dominant relievers. After all, he had just two seasons -- both late in his career -- in which he saved 16 or more games. But all throughout Betancourt's career, he held steady as an effective bullpen arm. His opponents hit just .227 against him, as the Venezuelan-born player pitched his way to a 3.05 FIP (fielding independent pitching) and 150 career holds.