PHILADELPHIA — Jacoby Ellsbury reached base five times and stole a team-record five bases Thursday night, leading the Boston Red Sox to a 9-2 victory over the Philadelphia Phillies.

Ellsbury, who went 3-for-4, also walked and was hit by a pitch. He began the night second in the American League in steals and now has 21 this season on 23 attempts.

For all of that, Ellsbury scored one run, after singling to lead off the top of the first. The Red Sox notched four runs that inning off Philadelphia starter Jonathan Pettibone (3-1).

Jarrod Saltalamacchia drove in three runs with a pair of doubles, and Jonny Gomes and David Ortiz homered for Boston, which earned a split of a four-game, home-and-home series with the Phillies.

In all, Boston banged out 14 hits in support of left-hander Franklin Morales (1-0), who earned a victory in his season debut. Morales, who had been on the disabled list with a bulging disk in his back and a strained pectoral muscle, pitched five innings and allowed two runs — both on Delmon Young’s first-inning homer — and four hits. Morales struck out two and walked two.

Craig Breslow and Clayton Mortensen combined for two innings of scoreless relief. Junichi Tazawa blanked the Phillies in the eighth, and Andrew Bailey did likewise in the ninth.

Pettibone, who worked five innings, did not allow another run after the first. He yielded six hits while striking out five and walking four.

The Red Sox expanded a 4-2 lead against Pettibone’s successor, Jeremy Horst, on solo homers by Gomes in the sixth and Ortiz in the seventh.

Gomes’ homer was his third of the season and second as a pinch hitter. He also homered in that role on April 30 against Toronto, and he has five pinch-hit homers in his career.

Ortiz, normally the designated hitter, started at first base for the first time this season and stroked his ninth homer, a majestic blast into the right field seats.

The runs were the first allowed by Horst in his last 11 appearances.

Boston added three runs in the ninth, on Stephen Drew’s groundout and back-to-back RBI doubles by Saltalamacchia and Jose Iglesias.

The Red Sox scored four times in the top of the first on Dustin Pedroia’s infield bouncer, an RBI single by Mike Carp and a two-run double by Jarrod Saltalamacchia.

The Phillies answered with Young’s two-run blast in the bottom of the first. It was his fourth homer of the season, and his first since May 22, seven games earlier.

NOTES: Phillies 1B Ryan Howard did not play, in part because of lingering problems with his left knee, in part because he was 0-for-4 in his career against Morales. Kevin Frandsen started in Howard’s place and went 1-for-3 with a walk. … Red Sox RHP Clay Buchholz threw off a mound for the second straight day on Wednesday and told reporters the soreness in the AC joint near his right shoulder has subsided to the point that the Red Sox are hopeful he can start Sunday against the Yankees in New York. Buchholz is 7-0 with a 1.73 ERA this season. … Phillies 2B Cesar Hernandez made his first major league start. He collected his first hit, a single in the first inning, and scored his first run on Young’s homer. He finished the night 2-for-4.

Mets 3, Yankees 1: Dillon Gee struck out a career-high 12 batters, and the New York Mets swept the season series from the New York Yankees for the first time with a 3-1 victory Thursday night at Yankee Stadium.

Gee allowed a solo home run to Robinson Cano in the third but virtually little else in 7 1/3 innings. He allowed four hits and no walks during his longest outing since last July.

Gee (3-6) retired the final 15 hitters he faced, getting nine of his strikeouts in that stretch. His most impressive run took place when he struck out Travis Hafner for the final out of the sixth, then fanned Lyle Overbay, Brennan Boesch and David Adams on 14 pitches in the seventh and Reid Brignac for the first out of the eighth.

Scott Rice got the final two outs of the eighth, and Bobby Parnell retired the side in order in the ninth for his ninth save.

The Yankees lost their season-worst fifth game in a row, and they fell for the seventh time in the past nine games. They managed just four hits and wasted a decent outing from Vidal Nuno (1-2), who allowed a two-run home run to Marlon Byrd in the second among three hits in six innings.

John Buck’s infield single in the eighth off Joba Chamberlain accounted for the other run for the Mets, who completed their fourth series sweep of the Yankees. Before this week, they had swept a three-game series at Shea Stadium in 2004 and a rain-shortened two-game set at Yankee Stadium in 2008.

The Mets topped the Yankees on Monday and Tuesday on Citi Field before winning Wednesday and Thursday in the Bronx.

After wasting Justin Turner’s leadoff double in the first, the Mets went up 2-0 on Byrd’s two-run home run to left field in the second. It was Byrd’s second home run in as many nights and sixth overall.

The Yankees halved the deficit in the third when Cano hit a 1-0 slider into the right field seats for his 14th home run.