It a feat most harness racing drivers never achieve as Aaron Merriman won 9 of the 15 races at MGM Northfield Park Wednesday (Dec. 7). And it’s not the first he has done it. Merriman started out winning the first three races on the program with Domovoy (Triumphant Caviar, 1:56.4, $2.40), Kneedeep N Custard (Custard