Kenny Hayes of the Maine Red Claws scored 52 points in the team's 118-113 win over Springfield on Sunday.
Hayes went 18-for-29 from the field (4-for-8 from three) and 12-for-12 from the line.
Hayes' previous career high was 32 points, which was scored in December.
Osiris Eldridge has also scored 52 points in a D-League game this season.