If you can't wait to try out Mario Tennis Aces, which is coming to the Switch on June 22nd, Nintendo has some good news for you. The company is hosting a pre-launch online tournament starting today, June 1st, at 6:00 PM PT through Sunday, June 3rd, at 11:59 PM PT. To participate, all you have to do is download the free demo from the Nintendo eShop or from the Mario Tennis Aces website.