WEST SACRAMENTO, Calif. — Jasson Dominguez stepped to the plate in the eighth inning, the only player in the ballpark at that point capable of overshadowing the best start of Will Warren’s career.

And Dominguez — aka “The Martian” — did just that.

An inning after notching the first two-homer game of his career, Dominguez made it three, swatting the first grand slam of his MLB career.

It helped send the Yankees to a 10-2 victory over the A’s in front of a sellout crowd of 12,049 at Sutter Health Park, the season home for at least the next three years for the team formerly known as the Oakland A’s.

Dominguez — learning leftfield on the fly this season, which may or may not have contributed to his slow start at the plate — went 3-for-3 with seven RBIs (he also had a sacrifice fly). He is hitting .250 with five homers and an .802 OPS.

The Yankees (22-16) outhit the Athletics 14-7, getting back-to-back home runs from Paul Goldschmidt (two hits) and Dominguez with two outs in the third inning to give Warren a lead that was never threatened.

Dominguez’s homer in the seventh made it 5-0 and represented the switch hitter’s first career homer from his weaker right side. He entered the game with 74 plate appearance and 63 at-bats while hitting righthanded.

Dominguez became the youngest Yankee ever with a three-homer game at 22 years, 91 days. The previous youngest was Joe DiMaggio at 22 years, 200 days on June 13, 1937, against the Browns.

J.C. Escarra, getting the start at catcher as Austin Wells will catch Saturday’s day game as well as Sunday’s, had two hits, as did second baseman Jorbit Vivas and DH Ben Rice.

The pitch-efficient Warren, meanwhile, dominated throughout his longest career outing.

Warren, 1-2 with a 5.65 ERA coming in, took a shutout into the eighth before departing with a 10-0 lead, two on and one out. Mark Leiter Jr. allowed an inherited runner to score, giving Warren a final line of 7 1⁄3 innings, one run, four hits, one walk and seven strikeouts against a team that had reached double digits in hits in each of its previous five games.

A’s righthander Osvaldo Bido (2-3, 4.75) allowed four runs (three earned), eight hits and two walks in 5 1⁄3 innings in which he struck out six.

The Yankees, who stranded four in the first two innings, took the lead for good in the third. After Aaron Judge (1-for-4 with a walk) and Rice struck out, Goldschmidt blasted an 0-and-2 slider to dead center for his fourth homer. Two pitches later, Dominguez rifled a changeup to right-center for his third homer.

The A’s (20-19) got their first baserunner when Tyler Soderstrom walked with one out in the fourth and their first hit when Brent Rooker singled hard to left. But Warren struck out Shea Langeliers looking at a sinker and JJ Bleday swinging at a filthy changeup to end the threat. Through four innings, Warren had six strikeouts and had thrown only 47 pitches.

The Yankees tacked on in what turned out to be a bizarre fifth. Trent Grisham worked a leadoff walk and, after Judge flied to right, Rice stung a single to center. Goldschmidt then flared one to center, where Bleday laid out and clearly trapped the ball, but third-base umpire Tom Hanahan ruled it a catch and a double play. Grisham, reading the play correctly, came around to score but was put back on third after the umpires convened and reversed the call on the field, always their prerogative.

Aaron Boone objected to Grisham being put back on third, but runner placement in itself is not reviewable, and the call stood. Dominguez’s sacrifice fly to left allowed Grisham to score for a 3-0 lead.

Boone said that before the start of this six-game West Coast trip, the plan was for DJ LeMahieu to join the Yankees at some point during this weekend series against the A’s, but LeMahieu’s rehab assignment games Thursday and Friday with Triple-A Scranton/Wilkes-Barre were rained out. As a result, Boone said, LeMahieu, who began a rehab assignment the previous week with Double-A Somerset, likely will be activated during the series in Seattle, which begins Monday. LeMahieu started the season on the injured list with a left calf strain.