AJ Lopez finished with 15 points for the Spiders (15-15, 5-12). Richmond also got 11 points from Jaden Daughtry. Mike Walz finished with 10 points, nine rebounds and four assists.
Montgomery scored 10 points in the first half for Dayton, who led 40-32 at halftime. Derkack put up 10 points in the second half for Dayton, including the game-winning shot in the final minute.
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The Associated Press created this story using technology provided by Data Skrive and data from Sportradar.