Mancuso's 10-yard TD run put the Spiders up 6-3 and the redshirt junior hit Fuller on a 40-yard bomb on the next possession. Richmond led 20-10 at halftime after Mancuso's 3-yard TD pass to Fuller.
Mancuso, 23 of 30 for 318 yards passing with an interception, extended the lead to 17 when he ran 6 yards untouched into the end zone in the third quarter. Jake Larson added a 31-yard field goal.
Charlie Fessler caught a career-high 11 passes for 147 yards for the Spiders (5-4, 4-1 Colonial Athletic Association), who outgained the Seawolves 470-288 in total yards and held them to 72 yards rushing.
The Seawolves (5-4, 2-3) scored on Tyquell Fields's second-quarter 57-yard pass to Delante Hellams Jr.
Synceir Malone's interception of a Mancuso pass in the first quarter led to Nick Courtney's 26-yard field goal for a 3-0 Stony Brook lead. Gavin Heslop blocked a fourth-quarter field-goal attempt, but the Seawolves were unable to cash in and were stopped on downs on their final drive.
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