Video: One of the cooler things about Overwatch is that it isn't just about shooting. You can heal, you can drop turrets, you can turn into a giant shield. But did you know that you can also, with a little work, play some badminton? All you need are a couple of Mercys (Mercies? A Murder of Mercy?), as many Genjis as you can muster and a Junkrat who's willing to basically be a ball machine.
And voila, Overwatch vs Mario Tennis. Though you're not going to get many epic rallies with a ball that explodes every few seconds.