Mario Tennis Open review. Classic Game Room reviews MARIO TENNIS OPEN for Nintendo 3DS, a fun Mario sports title with great controls, nice visuals, multiplayer and an amazing version of Super Mario Bros. played with tennis balls. CGR Mario Tennis Open video review features Nintendo 3DS Mario Tennis Open gameplay showing singles and doubles tennis action as well as characters such as my Mii, Mario, Luigi, Princess Peach, Donkey Kong, Yoshi, Boo, Bowser and Wario!!