Facebook's pro-am 'Mario Tennis' tourney includes the Williams sisters

Tennis superstars are teaming up with celebrity partners for a charity doubles tournament with a difference. They'll all be participating remotely, as the Stay at Home Slam will take place in Mario Tennis Aces. Each team will receive $25,000 to donat…
Source: Engadget | Facebook's pro-am 'Mario Tennis' tourney includes the Williams sisters