Alonso homered again, McNeil broke a tie with a pinch-hit, two-run double and the Mets beat the Toronto Blue Jays 5-4 on Sunday in Hill's successful debut.
Acquired from Tampa Bay in a trade Friday, the 41-year-old lefty stepped right into New York's injury-thinned rotation and delivered for the NL East leaders.
“Today was a great win and I was happy that I was able to contribute,” Hill said.
Five relievers followed him and held Toronto to one run over four innings. Edwin Díaz struck out three in a hitless ninth, fanning cleanup batter Bo Bichette on a full-count slider with a runner on second for his 21st save.
Hill threw only 49 pitches over the first five innings and worked around three leadoff doubles, taking a four-hit shutout into the sixth before running into trouble the third time through Toronto's power-packed lineup.
The veteran curveballer, pitching for his 11th team in 17 major league seasons, let the first three hitters reach in the sixth and was removed. He walked off the mound with the bases loaded to a warm ovation from the Citi Field crowd of 23,675.
“It was a crazy couple days,” said Hill, whose wife and son are still in Tampa, Florida. “It's kind of a whirlwind.”
Seth Lugo (3-1) allowed all three inherited runners to score, two on Bichette's single, as the Blue Jays took a 3-1 lead. But then Lugo limited the damage, and Alonso tied it in the bottom half with a two-run drive off reliever Ryan Borucki.
The slugger looked at teammates with palms up as he began rounding the bases, and playfully celebrated by carrying the club's stuffed home run horse through the dugout.
Alonso hit three homers to help New York take two of three in the series. He has five home runs since the All-Star break, when he repeated as Home Run Derby champion.
“I don't know if the derby played a role in it, but he's very, very confident right now," Mets manager Luis Rojas said.
McNeil gave New York a 5-3 lead later in the inning and extended his hitting streak to a career-high 12 games with a shot to right-center off Jacob Barnes (1-2), traded by the Mets to the Blue Jays last month.
Toronto trimmed it to 5-4 in the eighth on an RBI single by Teoscar Hernández off Trevor May, who combined with Aaron Loup to escape a bases-loaded, one-out jam. Loup retired Cavan Biggio to end the inning.
Toronto stranded nine runners, finished 14-4 in interleague play this season and fell to 2-14 against the Mets in Queens.
“It's funny 'cause when you see a guy like Rich Hill, it looks like you should be able to hit him. But that's what he does," Blue Jays manager Charlie Montoyo said. "He's a good pitcher and he keeps guys off balance and he makes big pitches when he has to.”
Hill became the second-oldest pitcher to make his Mets debut behind Hall of Fame lefty Warren Spahn, who was 43 in 1965. ... New York has used 55 players already this season, one short of the franchise record set in 2018. ... Sixteen pitchers have started a game for the Mets this year, most in the majors.
Toronto starter Ross Stripling rebounded from a pair of poor outings, yielding one run in five innings with six strikeouts and no walks.
“He was a lot better today,” Montoyo said.
Blue Jays: Pitching coach Pete Walker said rookie RHP Alek Manoah will rejoin the rotation after throwing 60-75 pitches in a simulated game Monday in Florida. Manoah has been nursing a bruise on the right side of his back.
Mets: RHP Jacob deGrom (forearm tightness) threw off a mound and felt good, according to Rojas. He said deGrom is progressing, but his next step hadn't been determined yet and no decision will be made on whether to schedule a minor league rehab assignment until the two-time Cy Young Award winner goes “full tilt” off a mound. ... RHP Carlos Carrasco could finally be ready to join the Mets after a strong rehab start Sunday for Triple-A Syracuse. The 34-year-old Carrasco struck out six and walked none in three scoreless innings of two-hit ball against Buffalo. He threw 32 of 38 pitches for strikes following a rough outing last time out. “Very encouraging,” Rojas said, adding that Carrasco’s next appearance could be in the majors or minors. Carrasco has been sidelined all season recovering from a hamstring injury after coming over from Cleveland in the January trade that also brought Francisco Lindor to New York. ... McNeil missed his third consecutive start because of left leg fatigue but expects to start a game in Monday's doubleheader against Atlanta.
Mets: Begin a five-game home series against Atlanta with a doubleheader Monday. RHP Marcus Stroman (7-8, 2.59) is scheduled to start the opener, with the nightcap TBD. The third-place Braves are five games behind the Mets.
Sampson scheduled to start for Chicago against St. Louis
St. Louis Cardinals (85-69, second in the NL Central) vs. Chicago Cubs (67-87, fourth in the NL Central)
Fedde scheduled to start for Nationals at Reds
Washington Nationals (64-90, fifth in the NL East) vs. Cincinnati Reds (79-75, third in the NL Central)
Hill scheduled to start for Mets at Brewers
New York Mets (73-80, third in the NL East) vs. Milwaukee Brewers (92-62, first in the NL Central)
Ellis expected to start for the Orioles against the Rangers
Texas Rangers (56-98, fifth in the AL West) vs. Baltimore Orioles (49-105, fifth in the AL East)
Suarez scheduled to start as Philadelphia hosts Pittsburgh
Pittsburgh Pirates (57-96, fifth in the NL Central) vs. Philadelphia Phillies (80-74, second in the NL East)
Gallen expected to start as Arizona hosts Los Angeles
Los Angeles Dodgers (99-55, second in the NL West) vs. Arizona Diamondbacks (49-105, fifth in the NL West)