OAKLAND, Calif. — The Mets expected Jacob deGrom on Saturday, but somehow got saddled with Jake from State Farm.

DeGrom’s afternoon at RingCentral Coliseum started badly and improved enough to get him through four innings, but that was about it.

Eliminate “and three runs or fewer from deGrom” as a phrase that could follow “death, taxes … ” With the two-time Cy Young award winner appearing mortal, the Mets lost 10-4 to the hapless Athletics, providing oxygen to the Braves, who beat the Phillies and moved within 1 ¹/₂ games of the NL East lead.

DeGrom allowed five earned runs on six hits and four walks over four innings to snap his MLB-record streak of 40 straight starts in which he surrendered three earned runs or fewer, dating to Sept. 3, 2019. The four walks allowed matched his combined total from his previous nine starts this season.

“I was just terrible,” deGrom said. “We had our guys go out and put up three runs [in the first inning] and I go give up four right away, lose the lead, that’s on me. I was really bad.”

The Mets didn’t receive much support from the bullpen, with Trevor Williams, Joely Rodriguez, Adam Ottavino and Trevor May combining to surrender five runs over the final four innings.

DeGrom only avoided a complete catastrophe in his start with help from a diving stab by Pete Alonso to snare Seth Brown’s line drive with runners on second and third to complete the fourth inning.

“I don’t think anybody ever took anything for granted — what [deGrom] has done over a large period of his career is very hard to do,” manager Buck Showalter said. “I think today is a reminder of that.”

Added catcher Tomas Nido: “Just a bump in the road. He’s human. On to the next.”

Alonso hit a two-run homer in the first inning to give the Mets a 3-0 lead, following Francisco Lindor’s sacrifice fly.

Lindor’s RBI was his 100th this season, marking the first time in his career he has reached that plateau. Alonso’s homer was his 38th of the year and gave him 123 RBIs this season, one short of the club record shared by Mike Piazza and David Wright.

DeGrom loaded the bases in the first inning on a single and two walks before Dermis Garcia hit a drive to left field. Jeff McNeil got a late start on the ball, then fell to the ground as he tried to recover. Two runs scored on the double.

“I got a good read on it and when I went to go back I just lost my footing and slipped a little bit,” McNeil said. “It cost us a few runs.”

Conner Capel’s RBI groundout extended Oakland’s lead before Shea Langeliers delivered an RBI double that put the Mets behind 4-3. DeGrom had never previously allowed four runs in the first inning of a start.

“A lot of uncompetitive pitches and then misses in the middle and that’s what happens,” deGrom said. “My slider, I kept yanking it. It was either yanked or in the middle. I wasn’t able to locate down, so they didn’t have to look for anything down. You eliminate the lower half of the zone, look for something up and they beat me.”

Mark Vientos’ first major league homer, a solo blast in the second inning, tied the score 4-4. On Friday, Vientos had delivered two hits and an RBI in a Mets victory.

Oakland regained the lead on Brown’s homer leading off the third against deGrom. The blast was the sixth allowed by the right-hander in his 10 starts this season.

“[DeGrom] is always so good — I didn’t help him out, so if I help him out he gets out of the [first] inning a little bit quicker,” McNeil said. “But he’s so good and it’s tough to see him have one of these kind of days. But he’s one of the best pitchers in the world, so he is going to come back the next time and give us a good game.”

Williams entered for the fifth and allowed a solo homer to Capel. Oakland extended its lead to 7-4 on Brown’s RBI single against Rodriguez in the sixth. Capel tripled against Ottavino to lead off the seventh — Darin Ruf tried for a diving catch in right on a bloop and booted the ball away from him — before Nick Allen’s RBI single extended the lead. May allowed two runs in the eighth after Ruf misplayed a drive by Brown to right field into a double.

“We did get a lot of people out there who needed to pitch, so I will take that as a positive,” Showalter said.