Ross-Miller was 8 of 8 from the line on his way to 14 points. Sim Bhullar scored a game-high 22 points, including seven in overtime.
New Mexico State (8-5) outscored Drake (6-3) 14-2 in overtime.
Drake trailed 57-47 with 8:47 remaining. Chris Caird hit back-to-back 3-pointers, capping a 17-8 run to pull Drake within one, 65-64 with 24 seconds to play. Two Ross-Miller free throws stretched the Aggies' lead to 67-64, but DK Eldridge fouled Jordan Daniels on a 3-point shot with 4 seconds left. Daniels made all three free throws, tying the game for the first time to send into overtime.
Richard Carter scored a team-high 21 points, Daniels added 18 and Caird 13 to lead the Bulldogs.