David Ortiz hit a grand slam for one of the Red Sox's four homers as they set a season high in runs, beating the Miami Marlins 15-5 Wednesday night on the hottest day of the year in Boston.
Mike Aviles, Jarod Saltalamacchia and Will Middlebrooks also homered.
With a game-time temperature of 95 degrees, the Red Sox pounded out 16 hits and won their fourth straight game and sixth in their last seven. They passed Toronto to move out of last place in the AL East at 35-33.
The Marlins lost for the 12th time in 14 games despite scoring four runs and nine hits in six innings against Felix Doubront (8-3).
Florida's Ricky Nolasco (6-6) gave up nine runs and nine hits in 3 1-3 innings.