Pete Alonso homered and had four RBIs in his return from the injured list, Jacob deGrom pitched six shutout innings and the New York Mets beat the Arizona Diamondbacks 6-2 on Monday night for their fifth straight victory.

Making his second start since coming off the IL, deGrom (4-2) allowed two hits while striking out eight and walking none. He lowered his ERA to 0.71, the lowest for a qualifying starter through May since Phillies left-hander Curt Short was at 0.64 in 1964.

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New York Mets' Dominic Smith and Jose Peraza (18) celebrate after scoring runs against the Arizona Diamondbacks on ball hit by Pete Alonzo in the third inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Pete Alonso homered and had four RBIs in his return from the injured list, Jacob deGrom pitched six shutout innings and the New York Mets beat the Arizona Diamondbacks 6-2 on Monday night for their fifth straight victory.

New York Mets' Pete Alonzo hits a two-run single against the Arizona Diamondbacks in the third inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Alonso hit a two-run single in the third and a two-run homer in the seventh for his first four-RBI game since his rookie season in 2019. The big first baseman had been sidelined since May 19 with a sprained right hand, but returned to the injury-riddled Mets without a minor league rehab assignment.

Arizona Diamondbacks' Carson Kelly hits a single against the New York Mets in the fifth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

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Arizona Diamondbacks third baseman Eduardo Escobar makes an off-balance throw for an out on a ball hit by New York Mets' Mason Williams in the sixth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks third baseman Eduardo Escobar makes an off-balance throw for an out on a ball hit by New York Mets' Mason Williams in the sixth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks pitcher Merrill Kelly throws against the New York Mets in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks pitcher Merrill Kelly throws against the New York Mets in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

New York Mets' Francisco Lindor gets ready to hit against the Arizona Diamondbacks in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

New York Mets' Francisco Lindor gets ready to hit against the Arizona Diamondbacks in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

The two-time Cy Young Award winner also had an RBI single for his ninth hit in eight starts this season. He was pulled after 70 pitches — the right-hander came back last Tuesday after missing a couple of weeks with tightness on his side.

New York Mets' Dominic Smith and Jose Peraza (18) celebrate after scoring runs against the Arizona Diamondbacks on ball hit by Pete Alonzo in the third inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

New York Mets' Dominic Smith and Jose Peraza (18) celebrate after scoring runs against the Arizona Diamondbacks on ball hit by Pete Alonzo in the third inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Alonso hit a two-run single in the third and a two-run homer in the seventh for his first four-RBI game since his rookie season in 2019. The big first baseman had been sidelined since May 19 with a sprained right hand, but returned to the injury-riddled Mets without a minor league rehab assignment.

Mason Williams, just promoted from the minors, made a tough catch at the center-field fence in his Mets debut to stop the Diamondbacks as they tried to rally in the seventh.

Kevin Pillar, wearing a protective mask on defense and the basepaths, came off the bench and singled in an inspirational return to the NL East leaders two weeks after getting hit square in the nose by a 95 mph fastball, causing multiple facial fractures.

New York Mets' Pete Alonzo hits a two-run single against the Arizona Diamondbacks in the third inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

New York Mets' Pete Alonzo hits a two-run single against the Arizona Diamondbacks in the third inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

More AP MLB: https://apnews.com/hub/MLB and https://twitter.com/AP_Sports

Arizona Diamondbacks' Carson Kelly hits a single against the New York Mets in the fifth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks' Carson Kelly hits a single against the New York Mets in the fifth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks third baseman Eduardo Escobar makes an off-balance throw for an out on a ball hit by New York Mets' Mason Williams in the sixth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks third baseman Eduardo Escobar makes an off-balance throw for an out on a ball hit by New York Mets' Mason Williams in the sixth inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks pitcher Merrill Kelly throws against the New York Mets in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

Arizona Diamondbacks pitcher Merrill Kelly throws against the New York Mets in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

New York Mets' Francisco Lindor gets ready to hit against the Arizona Diamondbacks in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)

New York Mets' Francisco Lindor gets ready to hit against the Arizona Diamondbacks in the first inning during a baseball game, Monday, May 31, 2021, in Phoenix. (AP PhotoRick Scuteri)