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Steven Senne, Associated Press
Boston Red Sox's Carl Crawford, right, hits an RBI single off Detroit Tigers' Justin Verlander as Tigers catcher Alex Avila, left, looks on in the fourth inning of a baseball game at Fenway Park, in Boston, Tuesday, July 31, 2012.

BOSTON — Clayton Mortensen pitched 2 2-3 shutout innings after Josh Beckett left with back spasms and the Boston Red Sox beat the Detroit Tigers 4-1 in a game halted by rain in the top of the sixth inning Tuesday night.

Detroit had the bases loaded with two outs when the tarp was rolled onto the field. The game was called 1 hour, 45 minutes later, giving the Red Sox their fourth straight win and sending the Tigers to their fifth loss in six games.

Mortensen (1-0) allowed one hit and three walks with one strikeout after being recalled earlier in the day from Triple-A Pawtucket.

Tigers ace Justin Verlander (11-7) gave up all four runs in the fourth inning when he issued two of his four walks.