
With one run already across in the sixth, Willingham hit a three-run homer to tie the game at 5. Two batters later, Plouffe hit a solo shot for his second of the day.
Plouffe also hit a solo homer in the second inning. Butera added a three-run shot in the eighth.
Bruce Chen (7-7), who had allowed just one earned run in each of his last two starts, gave up six earned runs and six hits in 5 2-3 innings. Irving Falu drove in four runs for the Royals..
Reliever Jeff Gray (4-0) got the last two outs of the sixth and the first of the seventh for Minnesota.
Plouffe homers twice, Twins beat Royals 10-8