Team USA, 'tries' and the 'sin bin': Rugby World Cup Sevens explained in 20 seconds

SAN FRANCISCO (KGO) -- The Rugby World Cup Sevens 2018 is taking place at San Francisco's AT&T Park between July 20 and 22.

Here's what you need to know about the game and the competition, which is held every four years in countries around the world. This is the first time the United States has hosted the cup.

Click here for more on the Rugby World Cup Sevens 2018.