The Mets are one of nine teams to never have a player hit 50 home runs in single season.
Pete Alonso is three home runs short of removing the Mets from the list. He also has a good chance to break Yankees OF Aaron Judge's single-season rookie home run record of 52.
The above two records are nice. However, if Alonso remains healthy and strong as he gets older, 2019 will prove to be the beginning of what has the potential to be an incredible career.