Coleman had a career-best 34 points for Nevada (3-1) at Hawaii on Tuesday.
After his basket made it 83-82, Lindsey Drew picked Pacific's Maleke Haynes with 54 seconds. AJ West grabbed the offensive rebound off Coleman's missed jumper with 26 seconds. West made both free throws and Pacific (0-3) missed three 3-pointers in the final 18 seconds.
Ilias Theodorou made a 3-pointer for Pacific with 5 seconds left in the first overtime to force the second.
Ray Bowles gave the Tigers a one-point lead with 32 seconds left in regulation and Lindsey Drew made 1 of 2 free throws for Nevada to leave it tied 65-all at the end of regulation.
T.J. Wallace scored 20 and Bowles added 19 to lead Pacific.