L.J. and his father Lee posed for a selfie during batting practice to capture the special moment.
"It's awesome. Are you kidding me? Awesome," said Lee, a former Mets first-round pick who played for the club from 1976 through 1981. "This is probably, until he gets to the big leagues, the best day for me professionally, to see us together."
Lee actually was excused from Yankees camp on March 15 and was able to watch the Mets play in Jupiter against the Miami Marlins. That day, L.J. walked, stole second and eventually scored the tiebreaking run on a wild pitch by Marlins reliever Kyle Barraclough in the ninth inning as the Mets won, 8-6.
However, Lee watched L.J. from the press box that day. In Tuesday night's Grapefruit League game, they both will be in uniform.
L.J., a second baseman, is in minor-league camp. But the Mets borrowed him for the cross-state trip to face the Yankees.
Drafted in the fourth round in 2013 out of the University of Connecticut, L.J. hit .263 with 23 RBIs and five steals in 335 at-bats for Double-A Binghamton last season.
"For a dad, being an evaluator of your son is so hard," Lee said. "We know how hard the game is. And when you watch your son play, there's nothing you can do. He's got a chance. He can swing the bat a little bit. He's paying his dues right now. I'm excited, because I think he has a pretty good future ahead of him."