Adam Dunn hit his 400th home run in the eighth inning Saturday night but Kansas City scored four times in the bottom of the eighth to pull away to a 9-4 win.

The Sox remained 1 1/2 games ahead of Detroit in the American League Central despite their late-inning collapse. Mike Moustakas capped the Royals' four-run rally by hitting a three-run home run off Brett Myers.

Dunn's homer, a two-run shot, traveled 428 feet and was hit off left-hander Tim Collins. Of Dunn's 35 home runs, 12 have been hit off left-handers.

Paul Konerko hit a two-run home run in the sixth. With Dunn's homer, he and Konerko become the first set of teammates to reach the 400-home run mark in the same season.

The Sox have taken great pride in their defense, but it deserted them in the third inning when they committed three errors that led to two runs.