Todd Frazier’s confidence hasn’t taken the same hit as his paltry batting average. His belief remains, even if the ugly numbers say differently. Until told otherwise, he still considers himself the Mets’ starting third baseman.

“I only have 50 at-bats — it’s a real [small] sample size — but I know what I’m capable of,” he told The Post. “It’s one of those things, maybe I get a couple of cheap hits here and there, next thing you know I get on a roll.”

Frazier found himself on the bench Friday night — J.D. Davis got the start — as the Mets opened a three-game home series with the Marlins, a spot he may have to get comfortable with once offseason acquisition Jed Lowrie (left knee capsule strain) joins the team.

But nobody has told Frazier to expect to see his playing time diminish, though manager Mickey Callaway did say in his pregame press conference that Frazier’s playing time “will get cut a little bit.” Whatever happens, he’s not focused on such a possibility.

“I’m not going to think about that until it happens,” he said. “For me, my confidence is still there, and I’m focused on being the starting third baseman for the Mets until I hear otherwise.”

When asked about Frazier’s declaration, Callaway said he wants all his players to think that way.

“He’s the starter when he starts, that’s really all I can say,” the manager said. “If we need to make adjustments, we will.”

Lowrie, out since early in spring training, was initially expected to be back in Queens on Friday, but he didn’t feel ready, according to Callaway, after going 2-for-23 in his rehabilitation assignment with Single-A Port St. Lucie and Triple-A Syracuse. The plan was for him to play again for Syracuse on Friday night and for his situation to get reassessed on Saturday.

“He feels like he needs some more reps,” Callaway said.

With Lowrie out, the Mets haven’t received the production they were hoping for from the 33-year-old Frazier. He arrived a month early for spring training, only to suffer a strained left oblique that cost him much of spring training. He missed the season’s first 21 games, and has performed poorly at the plate since returning. He has posted an anemic .143/.160/.265 slash line with a .425 OPS, two home runs and seven RBIs. In 49 at-bats, he has struck out 17 times without walking once. He has one hit this month, in 20 at-bats.

“It’s not ideal and it’s not fun, but you got to keep moving forward,” Frazier said. “You’re looking for a pitch, the guy makes a pitch you think it’s going to be in one spot, and it’s not.

“Sometimes, [I’m] trying to get four hits out of one at-bat. That’s something you can’t do.”