This is the 18th installment of the Up Next series in which we highlight the top underclassmen on Long Island. Previously, we featured Everett Zarzicki, Brian Brower, Stellan Zangari, Ryan Bush, Bryce Cutrone, Justin Ortiz, Colin Raymond, Jagger Adamo, JD Duffy, Chris Sultana, Matt Zambriski, Tucker Brown, Christian Calabro, Derek & Ryan Yormack, Andrew Poxon, Tristan Garcia and Evan Fallon. Special thanks to State Farm Ken Kortright Agency for sponsoring this year’s series. When it comes to improving as a ballplayer, it always helps to play against older competition. You can find out a lot about yourself when you’re not always the best player on the field. In the case of JT Bonventre, he is still often the best player on the field even when playing up. This past season, he...