The rain came just in time for the son of Motivator, who stepped up on his recent return at Sandown.
With four non runners, Neil Callan was able to get Mazeydd over from his wide draw in 12. He tracked the leader before making his challenge just before the final bend.
Mazeydd took a while to overcome the leader, Consider Yourself, but was well on top at the finish, winning by three and a half lengths.
Roger said: "He won his maiden on soft last year so we were hopeful that the rain would come in time.
"We have had plenty of the family and they have served the yard well over the years."