Tied at 57 with under three minutes to play, Jon Williams hit a deep 3-pointer from the wing, and Josh Williams added a 3 with 1:02 left for a five-point lead.
Yannis Mendy had 13 points and seven rebounds for Robert Morris (16-13, 12-4 Northeast Conference). AJ Bramah added 10 rebounds.
Jalen Gibbs had 19 points for the Mountaineers (10-18, 6-9), whose losing streak reached five games. Vado Morse added 10 points, and Damian Chong Qui had six rebounds.
The Colonials improve to 2-0 against the Mountaineers this season. Robert Morris defeated Mount St. Mary's 77-60 on Feb. 13. Robert Morris takes on Fairleigh Dickinson on the road on Sunday. Mount St. Mary's plays league-leader Merrimack at home on Sunday.
For more AP college basketball coverage: https://apnews.com/Collegebasketball and http://twitter.com/AP-Top25
This was generated by Automated Insights, http://www.automatedinsights.com/ap, using data from STATS LLC, https://www.stats.com
Copyright 2020 by STATS LLC and Associated Press. Any commercial use or distribution without the express written consent of STATS LLC and Associated Press is strictly prohibited.