Best season: 2002 - 72 games, 84.0 IP, 2.04 ERA, 223 ERA+, 4.1 bWAR
Byung-Hyun Kim joins the countdown as the highest-ranked relief pitcher on the list. After compiling gaudy numbers as a stand-out pitcher in South Korea from 1996-1998 (including a game against the U.S. Olympic team where he struck out 15 batters in 6 2⁄3 innings), Kim was signed by the Arizona Diamondbacks for the 1999 season. Featuring an unorthodox submarine delivery rising fastball, he flew through the minors with ease, striking out 42 batters in 38 2⁄3 innings between AA and AAA.