He retired as a Mariner following the 1998 season .
After six big - league seasons in Seattle , Swift went to San Francisco , where he enjoyed a breakout 21 - 8 season in 1993 .
Swift retired as a Seattle following the 1998 season .
After six big - league seasons in Seattle , Swift went to San Francisco , where he enjoyed a breakout 21 - 8 season in 1993 .