The helmet has a 29 on it so that might be Dustin Ackley. Matt is a very friendly outgoing guy who likes to welcome people to Citi Field.
“I’m Matt, nice to meet you.” – Matt Harvey #SubwaySeries pic.twitter.com/NSHQ5ZI669
— MLB (@MLB) September 19, 2015
Both went to UNC — and judging from their ages, likely played on the school baseball team at the same time. Probably just catching up.