E3 2019 technically starts today with a trio of Nintendo tournaments. The Super Mario Maker 2 Invitational 2019, Splatoon 2 World Championship 2019, and Super Smash Bros. Ultimate World Championship 2019 3v3 will all be taking place over the next several hours. Super Mario Maker 2 gets things started at 11 AM PT / 2 PM ET / 7 PM...