PHILADELPHIA (AP) — Jayson Werth homered and J.A. Happ worked three solid innings to give the Philadelphia Phillies a 4-3 win over the Pittsburgh Pirates.

Werth hit his third home run of spring training on Saturday, leading off the fourth inning against Hayden Penn. Chase Utley added two singles and drove in a run for the Phillies.

Happ allowed one run and five hits, completing a spring training in which he posted a 3.79 ERA in 21 1-3 innings. He is slated to be the Phillies' No. 4 starter this season.

The defending NL champions will open the regular season Monday against the Nationals in a game that will feature President Barack Obama throwing out the first pitch.

The Pirates return to PNC Park to open their season Monday against the Los Angeles Dodgers.

Happ allowed one run on five hits, while walking one and striking out two. He had a 3.79 ERA in 21 1-3 innings this spring. After shuffling from the bullpen to the rotation last season, the lefty is slated to be the Phillies' No. 4 starter, and will make his regular-season debut on April 9 in Houston.

Last season, Happ lost a battle for the No. 5 job to Chan Ho Park, but eventually worked his way into the rotation. He then dealt with rumors that had him going to Toronto in a deal for Roy Halladay. Through it all, he went 12-4 with a 2.93 ERA.

He's more relaxed this season.

"It was a less-stressful spring, there's no doubt about that," he said. "It was nice and low-key, and I'm happy flying under the radar. The confidence level is better overall, just after having a full year in last year and having success. I'll just try and carry that into this year."

Paul Maholm tossed three innings for Pittsburgh, giving up two runs on five hits. He struck out one.

NOTES. The Phillies had a combined 84,993 fans come for the two "on-deck" series games in Philadelphia, beating the previous record of 81,110 in 2004 against Cleveland, in the first year of Citizens Bank Park. ... Michael Dubee, the son of Phillies pitching coach Rich Dubee, worked a perfect eighth inning for the Pirates.