Neil Watson drilled a 3-pointer with three seconds left to play and Aaron Brown tacked on a pair of free throws a second later, allowing Southern Mississippi to snatch a 60-57 victory away from upset-minded Marshall Friday Night.
Watson's trey gave the Golden Eagles their only lead of the second half and only their second lead of the game — a brief, 3-2 first-half lead.
Marshall was bidding for its first win in seven starts in Hattiesburg. The victory was the seventh straight for Southern Miss, which remains tied with UTEP atop the Conference USA standings, each with just one loss.
Brown finished with 13 points and Michael Craig added another 12 to lead the Golden Eagles (20-3, 7-1), with Jerrold Brooks and Neil Watson each contributing 10.
Ryan Taylor paced Marshall (8-16, 22-7) with 17 points, with Kareem Canty adding another 11 and Chris Thomas 10.