Haymon was fouled hitting a three-pointer with 3.6 seconds left in regulation, then made the free throw to send the game to overtime.
It was Haymon again with a long bucket with just over two minutes left in the extra session that gave the team the lead for good as he finished the game with 17 points and seven rebounds.
Jacob Parker had 22 points while Thomas Walkup gave 12 points and 10 rebounds for the 12th-seeded Lumberjacks (32-2), who won for the first time in the NCAA Tournament and ran their winning streak to 29 straight games.
Treveon Graham had 19 points and seven boards, Jordan Burgess gave 14 points, while JeQuan Lewis had 13 points for the fifth-seeded Rams (26-9), who lost to Saint Joseph's in the Atlantic 10 tournament final, but was one of six teams from the conference to earn a bid to the tournament.
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