BOSTON — David Ortiz hit a two-run homer, four Boston pitchers combined on a three-hitter and the Red Sox beat the Oakland Athletics 4-0 on Saturday to complete a sweep of a rain-delayed day-night doubleheader. 

In the opener, Jason Varitek hit a two-run homer, Jon Lester allowed three hits in six innings and the Red Sox won 9-3. That game was delayed twice — by 45 minutes after the sixth inning and by 2 hours, 15 minutes after the seventh.

There was a one-hour delay in the top of the fifth in the nightcap. The first game had been moved up to noon from 1:10 p.m. to make room for the second game that was rescheduled from Sunday to avoid Hurricane Irene’s effects.