PORT ST. LUCIE — The Mets got their first real look at their new first baseman and third baseman Thursday. The results were mostly positive, with some bobbled balls that were to be expected.

Jorge Polanco and Bo Bichette reported to camp early this week to begin their transitions from the middle infield to the corners. Manager Carlos Mendoza, a former infielder himself and a former infield coach, worked closely with the two of them on the field at Clover Park, trying to gauge where they are in their learning curves.

Polanco worked on picks and footwork around the first-base bag, showcasing the soft hands that made him an effective middle infielder. While the hands will translate, the instincts are different. Polanco hasn’t quite learned how to use the bag and how to position himself for specific situations, and likely won’t be able to fully understand the nuances of the position until he starts experiencing them in Grapefruit League games.

Until then, the Mets are trying to mimic those situations on the backfields and during live bullpens to be able to provide instructions.

“We saw it today after a couple of at-bats, we put him out there [infield coach Tim Leiper] was talking to him about positioning and how far he needs to be off the base — things like that,” Mendoza said. “I can count that as anything under his belt at the position today because there was so much instruction going on. That’s what he’s going to take.”

With Bichette, the move from shortstop to third base isn’t quite as drastic as a move from shortstop to first base. The foundation of the position is the same, but it takes more use of the legs and the timing of the throws are different. There is more time to get the ball out from third base, which Bichette anticipated, but wasn’t able to fully get a feel for during his offseason workouts.

“I wouldn’t say [anything has been] a surprise,” Bichette said “It’s more forward-to-back than side-to-side, but I mean, shortstops definitely come in too. Having more time at third base is something that I’m getting used to, and understanding that I can take a little bit more time.”

The Grapefruit League season can’t come soon enough for the Mets.

“I haven’t played any games, so that’s going to be my biggest hurdle, but I’m excited for it,” Bichette said. “I’m excited to get comfortable there, and excited to play games.”

HOLMES VS. HITTERS

Right-handed starter Clay Holmes threw his first live bullpen of camp Thursday. Typically, pitchers don’t see hitters this early in spring, but under Mendoza, the Mets have come into camp ready for game action, plus Holmes is on an earlier schedule this year to be ready to pitch in the World Baseball Classic.

Holmes threw three simulated innings, facing big league teammates like Bichette, Mark Vientos and Luis Torrens.

“Day 2 of pitchers and catchers, and he’s already at three at ups and up to 46 pitches,” Mendoza said. “I don’t think that’s useful for everyone else in camp, other maybe Nolan [McLean] who is in the same boat. You don’t see that type of progression, but you’ve got to give them credit, because they’ve been preparing the whole offseason to be in these situations.”

McLean, another right-handed starter, will also pitch for Team USA in the WBC next month.

EXTRA BAGS

Francisco Lindor’s hamate surgery was without incident. Mendoza texted with him after the procedure Wednesday, and expects to see him in camp within the next few days.

The Mets made their signing of outfielder MJ Melendez official on Thursday, moving right-hander Tylor Megill to the 60-day injured list to make room on the 40-man roster. Megill is expected to be out all season as he rehabs from Tommy John surgery.