O'Sullivan allowed two runs on four hits and three walks while striking out two in Boston's win over the Angels on Sunday.
The Red Sox were in tatters following Saturday's embarrassing 21-2 loss. Apart from Saturday's ignominy, Boston's starters have pitched poorly of late and the bullpen has been taxed. So it was the journeyman O'Sullivan, called up from Triple-A to make a spot start, given the responsibility of stabilizing the team, and he did just that. It was an effort that earned him the adulation of Fenway Park and most likely another start this coming Friday against the Rays. Beyond the top three in the rotation -- David Price, Rick Porcello and Steven Wright -- the Red Sox are looking for someone, anyone, to grab hold of the final two spots.