Jarvis Garrett chipped in 13 points for Rhode Island (19-6, 11-3 Atlantic 10 Conference).
Rhode Island held a 41-27 lead at the break and was up 51-37 midway of the second half. The Patriots had a 7-2 run to close to 53-44 with 7:23 left. Matthews hit a jumper to start an 11-5 run to pull ahead 64-49 with 3:03 remaining. The Rams limited George Mason to seven points in the final 3:59.