Greer drove in three runs as the Bucs completed a season-opening sweep of Iona with a 14-4 victory at Thomas Stadium.
ETSU cemented the three-game sweep with an eight-run eighth inning.
It capped a remarkable opening weekend for Greer, who had nine RBIs in the three games.
Kyle Richardson had a grand slam for the Bucs in the big eighth inning. Cullen Smith went 4 for 5 for ETSU, while Greer, Jake Lyle, Noah Hill and Markell Graham each had two hits. Lyle scored three times.
Greer’s two-out RBI single up the middle in the third inning opened the scoring. He added another RBI in the fifth inning and a run-scoring triple in the sixth.
Meanwhile, Johnson City’s Daniel Sweeney earned his first win of the season, working five innings and holding the Gaels to one unearned run on five hits. He struck out four batters and didn’t walk any.
Iona tied the game at 1-1 in the fifth on a pair of ETSU errors. The second miscue, by Sweeney, let Joe DiMaio score. DiMaio had reached base on an error and moved to second on a bunt.
The tie didn’t last long, as ETSU tacked on three runs in the bottom of the fifth.
Graham drew a leadoff walk and advanced to second on Lyle’s bunt single. Smith then drove in Graham with a single and Greer followed with an RBI groundout. Hill’s run-scoring single made it 4-1.
ETSU scored in the fifth on a sacrifice fly by Lyle and in the sixth on Greer’s triple. Iona made it 6-3 with two runs in the seventh.
Ethan Cady’s two-run double in the eighth began the eight-run uprising that broke it open for ETSU. Iona intentionally walked Greer to get to Cady. Richardson’s grand slam capped the big inning for ETSU.
Up next for the Bucs is a game at Virginia Tech, set for Tuesday at 4 p.m. They play at home later in the week with a three-game series against Wagner. Games are scheduled for Friday (4 p.m.), Saturday (2 p.m.) and Sunday (1 p.m.)