Rivers finished with 20 points and Kenneth Ortiz had 19 points and a career-high 11 assists for the Seahawks (9-5, 3-0 Northeast Conference), who had lost three straight to the Blackbirds. Mario Moody also tallied 19 points, a career-high.
LIU (5-10, 0-3) led 27-23 before Moody hit a layup that sparked a 19-4 run for Wagner over the final 6 minutes of the first half. The Seahawks took a 42-31 lead into the break, and after LIU cut the deficit to 47-43, used a 13-2 run to take the lead for good, 60-45.
Wagner outrebounded LIU 37-24, shot a season-best 59 percent (29 of 49) and hit 9 of 10 from deep.
Jamal Olasewere's 16 points led LIU.
NCAA title-game hero Kris Jenkins says he will withdraw his name for the NBA draft and will return to Villanova for his senior season.
Andy Katz breaks down the likelihood of Villanova, Syracuse, North Carolina or Oklahoma making a run to the Final Four next season.
Florida State has announced that Xavier Rathan-Mayes will return to the court for his junior season. The 6-foot-4 guard declared for the NBA draft last month but did not hire an agent.