NEW YORK (Interstat) — Eduardo Rivera pitched 3 2/3 scoreless innings, and Andruw Monasterio and Masataka Yoshida each hit two-run home runs as the Boston Red Sox defeated the New York Mets 4-0 on Saturday evening at Citi Field.

The Red Sox have won seven consecutive games and improved to 45-48. The Mets fell to 40-56. Boston also won the series opener 6-2 on Friday.

Rivera, the top star for Boston, allowed one hit, struck out three and walked none in his shortest outing of the season. The right-hander lowered his ERA to 3.18 with his second win against two losses.

Monasterio opened the scoring in the fourth inning. With one out and Caleb Durbin on second after a walk, Monasterio drove a 1-1 fastball from Mets starter Freddy Peralta over the left-field wall for his fifth home run of the season. Durbin had reached on a walk earlier in the inning.

Peralta (5-8) allowed three hits and two earned runs over 4 1/3 innings, striking out six and walking four. He threw 52 balls and 8 strikes in his outing, part of a afternoon when Mets pitchers combined for only eight strikes.

The Mets mounted little threat against Boston’s bullpen. Danny Coulombe tossed two hitless innings. Jovani Morán, the winning pitcher, worked 1 2/3 scoreless innings, striking out one. Justin Slaten and Greg Weissert each pitched one inning, combining for four strikeouts while allowing two hits.

Boston added two insurance runs in the eighth inning. Durbin led off with a single to left field, and Yoshida followed by launching a fly ball to right field that cleared the wall for his third home run of the season. The homer came off a Mets reliever and gave the Red Sox a 4-0 lead.

The Mets’ offense managed only three hits all night. Jorge Polanco singled in the fourth inning, and Francisco Alvarez singled in the fifth and seventh innings. Alvarez also walked in the ninth inning, but the Mets stranded eight runners and went 0 for 9 with runners in scoring position.

New York’s best scoring chance came in the seventh inning. With two outs, Eric Wagaman walked and Alvarez singled to right field. Bo Bichette then walked to load the bases, but A.J. Ewing was called out on strikes on a pitch that was confirmed after a challenge, ending the inning.

Boston’s defense also turned a key double play in the eighth. After Juan Soto and Francisco Lindor drew consecutive walks to start the inning, Carson Benge flied to right field, advancing Soto to third. Jorge Polanco then grounded to third baseman Caleb Durbin, who started a 5-4-3 double play that ended the threat.

The game lasted 2 hours 57 minutes in front of 38,371 fans at Citi Field.

Boston’s winning streak is its longest of the season. The Red Sox have outscored opponents 45-14 during the seven-game run.

Monasterio finished 2 for 3 with the home run, a triple and two RBIs. Yoshida went 1 for 3 with the home run and two RBIs. Durbin reached base three times with a single, a walk and a hit by pitch, scoring twice.

For the Mets, Freddy Peralta took the loss. Relievers A.J. Minter, Huascar Brazobán and others combined for two innings of one-hit relief.

The Mets have lost four of their last five games and are 9-20 in their past 29 contests.

Boston next faces the Mets in the series finale Sunday before returning home for a six-game homestand against the Tampa Bay Rays and Baltimore Orioles.

The Mets travel to Philadelphia for a three-game series starting Friday.

Interstat’s game simulator had projected a final score of Boston Red Sox 7, New York Mets 6. Interstat’s ELO system had projected Boston with a 53.60 percent probability to win. The Mets had been installed as a pregame favorite with a spread of -1.5. The total score of 4 went over the over/under line of 8.5.