Dellin’s velo building up very slowly

Looking at Dellin Betances’ velocity numbers on the left-center field scoreboard at Spectrum Field on Sunday wasn’t encouraging.

The radar gun showed three fastballs at 92 mph and two at 90 during an eight-pitch outing against the Phillies in which he was pleased with his breaking ball and fastball location.

However, Spectrum Field’s readings have long been a tick below what the scout guns from behind the plate were clocking Betances at 87-91 mph.

“The delivery was good, location good, but I’m still not where I want to be with the arm strength,’’ said Betances, who struck out Bryce Harper to start the sixth inning.

Asked if there will be an uptick in velocity by Opening Day (March 28), Betances didn’t guarantee it.

“I hope so. I think I still have about four [spring training] games. Obviously, not there yet. See how it goes the next few games,’’ said Betances, who earlier in camp said he might not be up to his triple-digit speed numbers until May. “Mostly every spring it takes me a little while.’’

As long as there are no physical issues, Aaron Boone said he is satisfied his setup man’s velocity will climb.

Asked if he was concerned about Betances’ velocity, however, Boone admitted it’s on his mind.

“Yeah, a little bit. I do think he’s healthy and fine and just taking a while to find the arm strength,’’ Boone said after Betances’ fourth spring outing. “He said it’s akin to what he feels every spring training but just hasn’t broken through yet. Hopefully this next week, 10 days, he can find that arm strength and build on it.’’

Outside of some long counts he would rather avoid, James Paxton’s 4 ¹/3-inning outing against the Phillies was more than acceptable to Boone.

“Great, I thought his stuff was dominant,’’ Boone said of Paxton, who didn’t give up a hit, allowed a run and struck out four. “Stuff-wise he commanded the top of the zone with the fastball. He is right about where he needs to be.’’

Gary Sanchez took a ball on the right pinkie that also got the biceps on the same arm in the bottom of the fifth. “I’m fine,’’ Sanchez said. After going hitless in four at-bats and striking out twice, Sanchez is 5-for-26 (.192) with eight punchouts in nine games.

“Offensively I haven’t gotten the results I want, but you also have to have patience,’’ Sanchez said.