Downton, who was 7 of 9 from the floor, drove for his first basket with 13:56 left in the first half to give the Rams an 8-6 lead. He followed with two straight jumpers as Rhode Island led 12-6. The Rams never trailed again and took a 24-20 lead into the break.
Saint Louis tied it at 39-39 after Jordan Goodwin completed a 3-point play. Martin responded with a layup to put the Rams back in front. Rhode Island pushed its advantage to 52-43 after Martin drained a trey and Fatts Russell added a jump shot with 3:36 remaining.
Russell finished with 13 points and Cyril Langevine added six while pulling down nine rebounds for Rhode Island (12-9, 5-4 Atlantic 10 Conference)
Goodwin had 17 points for Saint Louis (14-8, 5-4) which beat the Rams 70-63 in the conference opener for both teams on Jan. 6. Hasahn French added 15 points to go with 10 rebounds.
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