Sophomore Kyle Gibbons led the Griffs with two tallies on the night, while sophomore Taylor Law and freshman Doug Jessey each added a goal.
The Colonials took the early lead in the contest, scoring 3:44 into the first period when Nick Chiavetta knocked in a rebound for the game's opening goal.
Robert Morris then added two quick goals in the second frame to take a 3-0 advantage. Tom Brooks scored an unassisted short-handed goal 1:50 into the frame and Zach Herrato knocked in a rebound 6:16 into the period for the three-goal advantage.
Canisius pulled to within two when Gibbons netted his ninth goal of the season with 1:12 left in the second. Freshman Stephen Farrell sent the puck toward the goal from the blue line and Gibbons gathered the puck and finished high for the 3-1 score. Law also registered an assist on the tally.
Robert Morris took its four-goal lead with two tallies in just over five minutes of action in the third stanza. Jeff Jones scored on a 3-on-1 rush 57 seconds into the period and Adam Brace netted a 4-on-3 power play goal off a rebound 5:06 into the frame.
The Griffs started its rally with two goals just 27 seconds apart, the first coming with 11:25 remaining in regulation when Law netted his team-leading 10th goal of the season. The sophomore scored off a pass from freshman Mitch McCrank to ignite the rally. Jessey posted his first assist of the night on the tally.
Jessey then scored a goal of his own just seconds later to pull the team within two, 5-3. Law sent the puck through the slot and the freshman buried the attempt for his second goal of the season. Gibbons also added an assist.
The Griffs then pulled to within one goal when Gibbons netted his second tally of the night with 4:55 remaining in the third. Sophomore Ben Danford lofted the puck over the Robert Morris forecheck and Gibbons finished on the other end for his 10th goal of his sophomore campaign. Jessey added his second assist and third point of the night on the goal.
Canisius, however, was unable to find the equalizer and Chiavetta sealed the Robert Morris victory with an empty-net tally with 59 seconds remaining.
The Colonials finished the game with a 39-34 advantage in shots. Robert Morris was also 1-for-5 on the power play, while killing all six Canisius power plays.
Senior Dan Morrison and sophomore Tony Capobianco split time in goal for the Griffs. Morrison stopped 17 shots in the start, while Capobianco recorded 16 saves.
Brooks Ostergard stopped 30 shots in the victory for Robert Morris.
The teams wrap up the season series tomorrow night in Buffalo. The Griffs host the Colonials at the Buffalo State Sports Arena beginning at 7:05 p.m.
Game Notes: The home team has won all five meetings since Robert Morris joined Atlantic Hockey ... Morrison is now 43 saves shy of the program's career mark with his 2,728 stops just shy of Bryan Worosz's record of 2,771 ... Gibbons and Law matched career highs with three points on the night, while Jessey recorded three points for the first time in his career.