Round 1

Game 1

Shinnosuke Abe - four home runs
Dae-Ho Lee - five home runs

Game 2

Wladimir Balentien - eight home runs*
Takeya Nakamura - eight home runs

Finals

 Dae-Ho Lee - six home runs
 Wladimir Balentien - zero home run

* Balentien advanced since he received more HR Derby votes.

Source: Daily Sports 7/20/2012

See also:

Mazda All-Star Game 2012: Game 2 Home Run Derby Results
Mazda All-Star Game 2012: Game 3 Home Run Derby Results