CLEARWATER, Fla. >> Philadelphia Phillies ace Roy Halladay has thrown six innings in his first rehab start since being sidelined by a shoulder injury.

Halladay gave up three runs and six hits, struck out four and walked three in Thursday’s game for the Gulf Coast League Phillies against Pittsburgh minor leaguers. He is scheduled to have a bullpen session Saturday and make another minor league start Tuesday.

The two-time Cy Young Award winner had surgery on his shoulder in May to repair a partially torn rotator cuff and remove a bone spur. He also had some fraying of the labrum.

Halladay threw 51 of 87 pitches for strikes. He had recently pitched in a simulated game.