Paul DeJong hit a two-run homer, Paul Goldschmidt added a solo shot off Marcus Stroman and the St. Louis Cardinals beat the New York Mets 4-1 in a doubleheader opener on Wednesday that extended their winning streak to six.

Kwang Hyun Kim pitched four innings, combining with Ryan Hemsley (3-0), Giovanny Gallegos and Alex Reyes (ninth save in nine chances) on a two-hitter.

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St. Louis Cardinals' Paul DeJong, right, is congratulated by third base coach Ron 'Pop' Warner (75) after hitting a two-run home run during the fifth inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Paul DeJong hit a two-run homer, Paul Goldschmidt added a solo shot off Marcus Stroman and the St. Louis Cardinals beat the New York Mets 4-1 in a doubleheader opener on Wednesday that extended their winning streak to six.

St. Louis Cardinals' Nolan Arenado (28) celebrates after hitting an RBI single as Cardinals first base coach Stubby Clapp (82) stands nearby during the third inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

The late-night firing Monday occurred after Mets stars Pete Alonso and Michael Conforto praised Donnie Stevenson, an apparently fictional hitting coach.

St. Louis Cardinals starting pitcher Kwang Hyun Kim pauses on the mound during the third inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

This was the NL Central-leading Cardinals’ first doubleheader of the season, shortened to seven-inning games under pandemic rules. The Mets were playing in their third twin bill in just over a month.

New York Mets starting pitcher Marcus Stroman throws during the fourth inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Nolan Arenado singled home a run with two outs in the third, and McCann's grounder cut the gap in the fourth. Kim escaped bases-loaded trouble by throwing a called third strike past Jonathan Villar and fanning Albert Almora Jr.

New York Mets starting pitcher Marcus Stroman throws during the fourth inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

HERNANDEZ HONORED

New York Mets starting pitcher Marcus Stroman throws during the first inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Mets: RHP Sean Reid-Foley was recalled from Triple-A Syracuse to serve as the 27th man.

St. Louis Cardinals starting pitcher Kwang Hyun Kim throws during the second inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Mets: deGrom (right lat inflammation) is to play catch Thursday and hopes to throw a bullpen session Friday, putting him on track to start Sunday against Arizona at Citi Field. ... RHP Carlos Carrasco (torn right hamstring) start a rehab assignment this weekend at Triple-A Syracuse.

While the Mets received uplifting news earlier in the day when manager Luis Rojas said ace Jacob deGrom could return to the rotation on Sunday, skidding New York did little at the plate in its first game after hitting coach Chili Davis was fired and replaced by Hugh Quattlebaum.

St. Louis Cardinals' Paul DeJong, right, is congratulated by third base coach Ron 'Pop' Warner (75) after hitting a two-run home run during the fifth inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

St. Louis Cardinals' Paul DeJong, right, is congratulated by third base coach Ron 'Pop' Warner (75) after hitting a two-run home run during the fifth inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

The late-night firing Monday occurred after Mets stars Pete Alonso and Michael Conforto praised Donnie Stevenson, an apparently fictional hitting coach.

James McCann hit into a run-scoring forceout, and New York’s batting average dropped to .235 with a major league-low 77 runs. The Mets went 0 for 5 with runners in scoring position, its RISP average falling to a big league-worst .198. New York has lost five of seven and is 11-13.

Stroman (3-3) lost his third straight start, allowing four runs — two earned — and seven hits in five innings.

St. Louis Cardinals' Nolan Arenado (28) celebrates after hitting an RBI single as Cardinals first base coach Stubby Clapp (82) stands nearby during the third inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

St. Louis Cardinals' Nolan Arenado (28) celebrates after hitting an RBI single as Cardinals first base coach Stubby Clapp (82) stands nearby during the third inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

This was the NL Central-leading Cardinals’ first doubleheader of the season, shortened to seven-inning games under pandemic rules. The Mets were playing in their third twin bill in just over a month.

Kim gave up one run and two hits.

Paul Goldschmidt homered in the first, a 417-foot line drive off the Big Mac Land sign on the front of the third deck in left.

St. Louis Cardinals starting pitcher Kwang Hyun Kim pauses on the mound during the third inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

St. Louis Cardinals starting pitcher Kwang Hyun Kim pauses on the mound during the third inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Nolan Arenado singled home a run with two outs in the third, and McCann's grounder cut the gap in the fourth. Kim escaped bases-loaded trouble by throwing a called third strike past Jonathan Villar and fanning Albert Almora Jr.

Arenado, who singled in his first two at-bats, reached on shortstop Francisco Lindor's throwing error in the fifth and DeJong hit a two-run homer on a slider, his first home run this year at home after hitting six on the road.

Miguel Castro (0-0) was to start the second game for the Mets in his first start since July 15, 2018. Johan Oviedo (0-0, 2.79) was to start for the Cardinals.

New York Mets starting pitcher Marcus Stroman throws during the fourth inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

New York Mets starting pitcher Marcus Stroman throws during the fourth inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

HERNANDEZ HONORED

Keith Hernandez, an All-Star first baseman, was voted in by fans into the Cardinals Hall of Fame. Hernandez was a two-time All-Star during 10 years in St. Louis and part of the 1982 World Series champions. A three-time All-Star with the Mets and an 11-time Gold Glove, he entered the Mets' Hall of Fame in 1997. “I enjoyed playing in both places,” Hernandez said.

ROSTER MOVE

New York Mets starting pitcher Marcus Stroman throws during the fourth inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

New York Mets starting pitcher Marcus Stroman throws during the fourth inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Mets: RHP Sean Reid-Foley was recalled from Triple-A Syracuse to serve as the 27th man.

Cardinals: LHP Bernardo Flores Jr. was recalled to join the bullpen and serve as the 27th player. Flores, Jr., who was claimed off waivers from the Chicago White Sox on April 1, had been scheduled to start Friday for Triple-A Memphis.

TRAINER’S ROOM

New York Mets starting pitcher Marcus Stroman throws during the first inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

New York Mets starting pitcher Marcus Stroman throws during the first inning in the first game of a baseball doubleheader against the St. Louis Cardinals Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

Mets: deGrom (right lat inflammation) is to play catch Thursday and hopes to throw a bullpen session Friday, putting him on track to start Sunday against Arizona at Citi Field. ... RHP Carlos Carrasco (torn right hamstring) start a rehab assignment this weekend at Triple-A Syracuse.

Cardinals: RF Dylan Carlson was removed the fifth inning with a bruised right shin. He fouled off a pitch in his at-bat in the inning. ... RHP Miles Mikolas (right shoulder) was scheduled to begin his rehab assignment Wednesday night in a start for Memphis against visiting Durham. Mikolas, who missed the 2020 season (right forearm strain) and was placed on the 10-day injured list on March 28.

UP NEXT

St. Louis Cardinals starting pitcher Kwang Hyun Kim throws during the second inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

St. Louis Cardinals starting pitcher Kwang Hyun Kim throws during the second inning in the first game of a baseball doubleheader against the New York Mets Wednesday, May 5, 2021, in St. Louis. (AP PhotoJeff Roberson)

RHP Taijuan Walker (1-1) is to start Thursday's series finale for the Mets against RHP John Gant (2-2).

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