Mickelson threw batting practice to 18 members of the Toledo Mud Hens, most of them pitchers. He hopes to earn a chance to pitch in a real game for the Triple-A affiliate of the Detroit Tigers.
Mickelson, a 21-time winner on the PGA Tour, and Toledo manager Larry Parrish said Detroit general manager Dave Dombrowski would decide whether to add the golfer to the roster.
'I know I don't have the talent the players here do, but this is a lifetime dream,' Mickelson said.
'This comes without any ambition on my part, and I'm hoping Dave Dombrowski is open to the idea. If not, I understand. I would never want to do anything to discredit the game,' Mickelson said.
Mickelson golfs left-handed but throws right-handed. He often plays catch to loosen his rotator cuff, and has worked with former Texas Rangers pitching coach Tom House.
None of the Toledo batters homered off Mickelson in a workout that had its serious and lighthearted moments.
Mickelson had duck to avoid getting hit by Steve Avery's line drive up the middle. Mud Hens catcher Yohanny Valera stepped into the batting cage with a sand wedge instead of a bat.
Michael Miller, the president of the Mud Hens' board of directors, arranged the workout through Mickelson's swing coach, Rick Smith.
Mickelson's workout at Fifth Third Field was closed to the public but drew many fans watching beyond the outfield gates, as well as the Louisville Bats in the visiting dugout.
Earlier this month, he threw to six players from the Akron Aeros, the Double-A affiliate of the Cleveland Indians, during the NEC Invitational.
Mickelson offered $300 to anyone who could hit a homer off him, and the best anyone did was hit a fly to the warning track.