No. 7: Seung-hwan Oh (2016-2017)
Another pitcher from South Korea, “Final Boss” signed a 2 year, $5 million deal with the Cardinals and became an instant success out of the bullpen.
During 2016, Oh had a record of 6-3 while converting 19 save opportunities, 14 holds, and maintaining an ERA of 1.92. This dominate debut for the Cardinals would falter in his second season, as his 20 saves were accompanied by an ERA of 4.10.
Final Boss did give the Cardinals plenty of value for a player only making $2.5 million each season. Oh would bounce back in 2018 with the Blue Jays and Rockies, but has not pitched in a big league game since 2019.