Sullivan was without Seth Mesey for the second time in three games on Tuesday at New Haven, but the defense stepped up in a 41-29 Four Rivers Conference win.
The Eagles (14-7) shut the Shamrocks out in the fourth quarter and yielded just eight second half points.
Justin Biermann’s 19 points led the way for the Eagles, who had just four players score.
Biermann and JC Beckett teamed up to pace Sullivan in the first half, scoring 21 of the Eagles’ 22 points.
Beckett nailed three 3-pointers in the first half and finished with 12 points.
Adam Weiland scored six points and Chris Erxleben added four.
Sullivan attempted just 29 shots as they slowed down their usual fast pace to play at New Haven’s speed.
The defense tripped up New Haven with three turnovers in the early minutes of the first quarter. Sullivan jumped out to a 12-4 lead on back-to-back 3-pointers by Beckett.
New Haven trailed 15-7 with just over a minute to play in the period, but closed out on a 7-0 run.
Kyle Ruediger’s basket with under 20 seconds left got the Shamrocks within three. Sullivan turned the ball over and were whistled for a technical foul on the inbounds pass after having six players on the court.
With seven seconds left, Seth Schenck hit two free throws to bring the Shamrocks to a 15-14 deficit.
New Haven briefly grabbed a 21-19 lead with 1:45 to play in the second half after Ross Seitter hit a 3-pointer from the corner.
But Sullivan took the lead back for good after Beckett matched it on the other end.
The Eagles led 22-21 at the half.
Sullivan jumped out to a 27-21 lead early in the second quarter. Chris Erxleben scored on a three-point play after Biermann jumped a New Haven pass and found him on the fast break.
The Shamrocks would get back within two on a three-point play by Austin Madden, but he was unable to convert the free throw.
Weiland would score the last five points of the quarter for Sullivan, first draining a 3-pointer with around 3:30 to play, then scoring on a putback with under a minute to play. Sullivan was ahead 35-29 after three quarters.
The Eagles had just one basket in the final period. Biermann’s putback extended the lead to 37-29.