CLEARWATER, Fla. -- Roy Halladay threw 56 pitches in a sterling effort Wednesday, but one fastball clearly stood out in the Phillies' 6-3 victory over division rival Washington.

Halladay threw a fastball behind Tyler Moore moments after Stephen Strasburg hit Chase Utley in the left foot. (Utley stayed in the game and sprinted after a ground ball in the next inning.)

Strasburg told reporters he wasn't throwing at Utley and had no reason to throw at him.

Halladay didn't wait for answers before delivering his own verdict.

Halladay told reporters the pitch "slipped," then smiled. Halladay added that "it wouldn't have been the worst thing" if his pitch hit Moore.

Moore doubled later in that at-bat, but that was about the only damage Halladay allowed. He gave up just one other hit in four scoreless innings.

Halladay struck out two and didn't allow a runner to reach third base in his short duel with Strasburg, a matchup of All-Stars that drew the Phillies' largest home crowd this spring.

The Nationals' ace struck out six in 3 2/3 innings, including the side in the second inning.

The Phillies scored two off Strasburg in the third on Michael Young's infield single and Ryan Howard's groundout.

The Phillies stretched their lead to 4-0 in an impressive two-out rally in the fifth.

Three consecutive lefties -- Howard, Domonic Brown and Laynce Nix -- got hits off left-handed reliever Fernando Abad. Nix's flare down the left field line drove in Howard and Brown.

Brown had two more hits, raising his spring average to .386.

The Nationals closed within 4-3 in the third off reliever Chad Durbin, who allowed four hits, including Anthony Rendon's third home run this spring.

Josh Fields hit a first-pitch homer to start the bottom of the seventh, during which the Phillies tacked on another run to make it 6-3.

Catching prospect Tommy Joseph had his best outing. He threw out a runner trying to steal second and added three hits.

Cliff Lee is scheduled to make his third start Thursday when the Phillies host Minnesota.