SAN FRANCISCO (Interstat) — The New York Mets, powered by a dominant start from Nolan McLean and a pair of home runs from Francisco Alvarez, erupted for 15 hits in a 10-3 victory over the San Francisco Giants on Friday night at Oracle Park.

A crowd of 38,613 watched the Mets even their season record at 4-4, while the Giants fell to 3-5. The result flipped the script from Thursday’s series opener, which San Francisco won 7-2, and defied pregame projections that favored the Giants.

The most important part of the game was the immediate and sustained offensive pressure applied by the Mets, which began in the first inning and never relented. Facing Giants starter Tyler Mahle, the Mets quickly loaded the bases on three consecutive singles from Francisco Lindor, Juan Soto and Bo Bichette, the latter driving in the first run. Though they grounded into a double play, they added a second run on a two-out RBI single from Marcus Semien, setting an aggressive tone that would last all night.

McLean, the winning pitcher, was the catalyst for New York’s success. The right-hander delivered 5 1/3 strong innings, allowing just one hit and one earned run while striking out four. He efficiently navigated the Giants’ lineup, facing the minimum through five innings and preserving the early lead his offense provided. His performance built on a solid outing his last time out, a tough-luck loss to Pittsburgh on March 29.

The Mets broke the game open in the fourth inning against Mahle. After a leadoff single by Mark Vientos, Semien launched a two-run homer to center field. Two batters later, Alvarez followed with a towering solo shot to center, extending the lead to 5-0. Mahle took the loss, falling to 0-2 after surrendering five earned runs on eight hits over five innings.

New York added three more in the seventh to put the game out of reach. Alvarez led off the frame with his second homer of the night, a solo blast to left field. Lindor walked, advanced to third on a double by Bichette, and scored on an RBI single from Luis Robert Jr. Vientos later drove in Bichette with a single, making it 8-0.

San Francisco finally got to McLean and the Mets’ bullpen in the sixth. Consecutive walks to Harrison Bader and Patrick Bailey set the table for Willy Adames, who lined a ground-rule double to right-center, scoring Bader. A subsequent groundout brought Bailey home, cutting the deficit to 8-2.

The Giants added a run in the eighth on an RBI single by Luis Arraez, but the Mets responded with two insurance runs in the ninth on an RBI double from Brett Baty and a run-scoring force out from Carson Benge.

Alvarez finished 2 for 5 with two homers and two RBIs, while Semien went 3 for 5 with a homer and three RBIs. Bichette also had three hits and an RBI for New York, which grounded into three double plays but still managed its highest run total of the young season.

The Mets’ bullpen, featuring Brooks Raley, Luis García and Huascar Brazobán, combined for 3 2/3 innings of relief, allowing one run on three hits while striking out three. For San Francisco, reliever Matt Gage provided 1 2/3 scoreless innings of work.

The game time was 3 hours, 4 minutes. The teams will continue their three-game series Saturday at Oracle Park.

NOTES: The Mets’ 10-run output came after they had scored just five total runs in their previous three games. … The Giants have lost five of their last six. … The total of 13 runs went well over the pregame over/under line of 7. … Adames’ sixth-inning double was the Giants’ only extra-base hit until Jerar Encarnacion’s eighth-inning double. … New York pitchers threw 66 balls to 20 strikes, while San Francisco’s staff threw 68 balls to 17 strikes.