The Golden Eagles (12-2) broke open a tight game in the second half and closed on a 13-2 run with Aaron Brown adding 13 points and Jerrold Brooks 11. Craig's 14 points are a season high, and he added 11 rebounds.
The game was close -- tied six times -- and neither team led by more than six until Watson capped a run that had the Eagles up 60-48. Southern Miss owned the boards, 37-22, and outscored the Rams 42-18 in the paint.
The Rams came back to 64-62 when Matthews scored with 5:15 remaining, but Southern Miss hit 9 of 10 at the line down the stretch.