#6- Juan Guzman- 21.1 WAR
Juan Guzman was dealt to the Blue Jays from the Los Angeles Dodgers in exchange for Mike Sharperson in the fall of 1987. Guzman would make his MLB debut with the Blue Jays in 1991 finishing 2nd in Rookie of the Year voting, second to only Chuck Knoblauch. Toronto rookies Mike Timlin and Mark Whiten (traded mid-way through the season) would also finish tied for sixth in the rookie voting.
Guzman’s best season came in 1996 when he went 11-8 with a 2.93 earned run average with a 6.8 WAR in 27 starts for the Jays. The right-hander would remain in Toronto for eight seasons totaling a 76-62 record with a 4.07 earned run average in 195 career starts.
The Blue Jays would deal Guzman to the Baltimore Orioles at the trade deadline in 1998 for Shannon Carter and Nerio Rodriguez. Neither players would amount to anything with Carter surpassing Triple-A.
Over the course of his 10-year career with the Jays, Orioles, Reds and Devil Rays, Guzman racked up a 24.6 WAR, albeit most of it was during his Blue Jays days.