Due out May 20th in North America, Mario Tennis Open is Nintendo's next big title for the 3DS. This new trailer showcases some of the side games featured in the title. From Super Mario Tennis to the returning Ring Shot, there's no shortage of mini-games to hone your tennis skills to. You can then take your earned coins and personalize your Mii with all sorts of unique clothing and tennis rackets. Just view the video below to see all of this in action.