The 21 points tied a career high for Martinez, who added six rebounds. Morales also had six rebounds.
Elijah Ford had 14 points for Wagner (12-6, 12-5 Northeast Conference), which earned its fifth straight home victory.
Both teams set season records for scoring in the first half. Wagner scored 46 first-half points, a season high for the home team, while the 43 first-half points for Merrimack were the best of the season for the visiting team.
Mykel Derring had 14 points for the Warriors (9-8, 9-8). Jordan Minor added 13 points and Mikey Watkins had 12 points.
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