Betemit hit an RBI single in the seventh, and a three-run double in the eighth.
New York's Johnny Damon had three hits, one a solo homer in the sixth, while Hideki Matsui added three RBI and Andy Phillips had two hits and one RBI. Both Robinson Cano and Bobby Abreu score twice as the Yankees drew within four games of Boston in the AL East.
Winner Chien-Ming Wang (14-6) scattered three earned runs and nine hits over six innings.
Loser Jeremy Bonderman (10-6) surrendered four runs -- three earned -- on seven hits and five walks in six innings. He struck out five Yankees.