Trailing 17-6 in the fourth quarter, Jeff Sinclair found D.J. Pearson for a 4-yard touchdown to cut Robert Morris' (4-6, 3-4 Northeast Conference) deficit to 17-14. Sinclair finished 11 of 25 for 145 yards and two touchdowns.
Sacred Heart (2-8, 1-6) looked to lock up the victory when they intercepted Sinclair for the fourth time with 4:24 seconds left in the game, but Sinclair responded on Robert Morris' next drive.
After forcing Sacred Heart to punt with 2:57 left, Sinclair capped off an eight-play 82-yard drive finding Groat for 2-yards and the winning touchdown with 35 second left.
Keshaudas Spence led Sacred Heart on the ground with 113 yards on 23 carries.
Robert Morris now leads the all-time series 8-7.
Ohio State remained No. 1 in the AP Top 25 and tied a poll record Sunday despite lagging support from voters. Meanwhile, No. 2 TCU and No. 3 Baylor edged forward and No. 4 Michigan State slipped.
Will Grier threw four touchdown passes to four receivers -- all in the first half -- and No. 25 Florida downed third-ranked Mississippi 38-10 on Saturday night.
Leonard Fournette highlighted his SEC-record third straight 200-yard game with a 75-yard touchdown run, and No. 9 LSU overcame Eastern Michigan 44-22 on Saturday night.
An officiating error led to an Oklahoma State touchdown Saturday in the Cowboys' 36-34 win over Kansas State.
Texas A&M receiver Ricky Seals-Jones, who was ejected for targeting midway in the second quarter of Saturday's game, took to Twitter late in the game, retweeting a tweet that questioned the call.
As if things weren't going bad enough at Texas, the Longhorns appear to have players on Twitter during lopsided losses and jabs at their coach accidentally being sent from other nearby teams.