Third base becoming sore spot for Bombers

A day after Gleyber Torres underwent Tommy John surgery that will knock him out for the season, ending any hope he could get to the majors in 2017, the Yankees’ current third baseman, Chase Headley, also went down with an injury.

Headley missed Thursday’s 10-5 loss to the Angels with back spasms and manager Joe Girardi believed he could miss Friday’s game.

Girardi said the spasms “probably” are related to the lower back issues Headley has dealt with in the past. Headley played well for a stretch earlier this month, but was in a 1for-10 skid. Ronald Torreyes started in his place.

As for Torres, he had figured to make a push to get to the majors by the end of the season before he suffered a torn UCL to his left elbow while making an awkward slide into home Saturday with Triple-A Scranton/ Wilkes-Barre.

The top prospect acquired last July in the deal that sent Aroldis Chapman to the Cubs impressed the Yankees throughout the spring and first half of the season — and expressed optimism he would do the same next year.

“Twenty-one is so much younger [than most players at major league spring training],” Torres told reporters before Triple-A Scranton/Wilkes-Barre’s game in Moosic, Pa., on Thursday.

“Now I’m 100 percent ready and focused on next year,’’ said Torres, who the Yankees had been using at third and second base, in addition to shortstop. “When I feel better and start my rehab, everything will be 100 percent and I’ll put on a good show for spring training.”

Torres added he expects to resume baseball activities in November.

The Yankees have lost six of Masahiro Tanaka’s past seven starts and the righthander already has given up 21 homers this year — but he also managed to strike out 10 batters in Oakland in his most recent outing.

“It is a positive from what I take from that start,” Tanaka said through an interpreter.

The Yankees have held that up as proof Tanaka is not injured.

The actual problem, according to Girardi, is inconsistency with his pitches.

“Same thing as Michael [ Pineda] last year,’’ the manager said. “When Michael was on, he struck a lot of people out; when he made mistakes they hit home runs… [The strikeouts are] a good sign.”