Greg Bird seems to have figured out the biggest hole in his game

Greg Bird had just three at-bats against Steven Matz going into Saturday, but Aaron Boone wasn’t sure how much success the first baseman would have facing the Mets’ southpaw. “I don’t think he had the greatest matchup with Matz,” Boone said afterward. “All those high fastballs.” And Bird hadn’t been productive against lefties since returning…