As ESPN tries to transition to streaming and attract younger viewers, the sports-media giant is venturing outside its comfort zone with its newest star: Pat McAfee. WSJ's Isabella Simonetti explains why the F-bomb-throwing former NFL punter is a big bet for the network. Further Reading: - ESPN Bets Big on Pat McAfee, an F-Bomb-Throwing YouTube Star  Further Listening: - How Americans Watch Sports Is Changing  - The Troubled Second Act of Disney CEO Bob Iger  Learn more about your ad choices. Visit megaphone.fm/adchoices