Freshmen Mitch McCrank and Stephen Farrell both scored in the victory for the Griffs.
Sophomore netminder Tony Capobianco recorded 29 saves to earn the win in goal.
"It was a complete team effort tonight and we did a good job responding to pressure to win a critical game," said Canisius head coach Dave Smith. "Tony Capobianco was the best player out there tonight and Mitch McCrank had the best weekend of his career. Stephen Farrell came up with a big score for us and his first goal - a gamewinner - is one that he'll remember for awhile."
Canisius struck first in the contest, scoring with 3:41 remaining in the opening period. Sophomore Kyle Gibbons put a shot on goal but had his attempt saved. McCrank was there to clean up the rebound and knock the puck in for his second goal of the season.
The Griffs extended their lead to two when Farrell netted his first collegiate goal 4:03 into the second frame. The freshman defender sent the puck through traffic from the blue line and it found the back of the net for the 2-0 advantage. Sophomore Patrick Sullivan and freshman Matthew Grazen both registered an assist on the eventual game-winning tally.
Canisius kept the Colonials off the scoreboard until just 63 seconds remained when Adam Brace scored an extra-attacker goal. Brace redirected a shot from the blue line to bring Robert Morris within one, 2-1.
The Colonials, however, were unable to find the equalizing tally. Capobianco came up big with a number of key saves down the stretch, including three difficult stops in the final 30 seconds of play to preserve the 2-1 victory.
Robert Morris finished the game with a 30-25 advantage in shots on the night, including a 12-6 edge in the third period. Neither team was able to score on the power play with the Griffs going 0-for-4 with the extra-man advantage and killing all seven Colonial power plays.
Canisius returns to action on Thursday, hosting Atlantic Hockey rival RIT at the Buffalo State Sports Arena. Game time is slated for 7:05 p.m.
Game Notes: The home team has won all six meetings in the series since Robert Morris joined Atlantic Hockey ... Canisius has surrendered just 11 goals in its nine wins this season (1.22 average) ... In seven of the team's nine victories, the Griffs goaltenders have allowed one or fewer goals ... In its nine wins, Canisius is averaging just 2.44 goals per game (not including empty-net scores) ... Seven of the team's nine wins have been by just one goal before empty-net tallies.