NEW YORK – Mets catcher Francisco Alvarez sat on a fastball last night like it was a clubhouse sofa.

Alvarez got ahead 3-0 against Orioles reliever Seranthony Domínguez – oh, let’s just call him the closer and stop hedging – and unloaded for his first career walk-off hit of any kind. And man, did he enjoy it.

Well, what he saw of it.

Alvarez made contact, held up the bat with one hand, released it and turned to the Mets dugout. He never looked back at the ball, gesturing to teammates with both hands and slapping his chest multiple times before beginning to round the bases. His jersey was pulled below his left shoulder after reaching home plate and being mobbed.

Domínguez struck out the first batter he faced. He struck out three Red Sox in the ninth inning the previous day. But he’s also surrendered home runs in back-to-back appearances.

The 1983 Orioles had three future Hall of Famers on their roster but also reserves who stepped up in pressure situations, contributions made from top to bottom that led to the organization’s last World Series championship.

This year’s club is reliant on 26 players, too early to know who might be ticketed for Cooperstown. And they keep finding new and creative ways to win.

It could be a starter or reliever, a regular or a backup. Many times, it’s a group effort.

In his first game against the Mets since they traded him in December, catcher James McCann had a two-run single in the fourth inning, a two-run double in the sixth and an RBI single in the seventh to tie his career high. Rookie Jordan Westburg reached base four times, scoring from first base in the sixth on Ryan O’Hearn’s tie-breaking fly ball that fell in right-center field, and hammering a 424-foot, three-run homer in the seventh.

Mike Baumann got a big double play to end the top half of the inning and retired all four batters that he faced.

The Orioles enjoyed their trek to Toronto, taking three of four from a Blue Jays team that had won 21 of 28 games heading into that series. The Orioles outscored the Blue Jays 24-10 in the series. 

They left Canada with a 67-42 record and have now won four of five, eight of 12 and 18 of the last 25 games. They are 13-7 in the second half.

Tonight the Orioles play the New York Mets, and the Birds have lost their past two series against National League teams. They went 1-2 versus the Dodgers and Phillies, but they began the second half with a three-game sweep of Miami.

The Orioles are just 15-14 (.517) against NL teams but they are 52-28 (.650) against American League teams.

The Orioles pitched well at Rogers Centre, with their starting pitchers recording a 2.92 ERA in the four-game series while the bullpen allowed just one run in 10 1/3 innings. Over 35 innings at Toronto, Baltimore pitchers allowed 18 hits and 10 runs with 13 walks and 41 strikeouts.

The Orioles are back home for a weekend series against the Mets, followed by three games against the Astros.

Ryan Mountcastle, who went 11-for-13 with four doubles and six RBIs in Toronto, is batting second and playing first base. He tied the club record for hits in a series of four games or fewer. Merv Rettenmund went 11-for-18 when the Orioles swept Cleveland in a four-game series in September 1971.

In 18 games since returning from vertigo, Mountcastle has gone 23-for-50 (.460) with a 1.220 OPS, seven doubles, two home runs and 10 RBIs.

Adley Rutschman is leading off and serving as designated hitter. Gunnar Henderson is batting third and playing shortstop.

Ryan O’Hearn stays in right field. Jordan Westburg is the second baseman. Ryan McKenna starts in center field.