23 Massive Athletes You Don’t Want To Go Up Against

7. John Isner — Tennis

This tennis tall man turned pro in 2007 and won a title almost every year since 2010. It’s hard to say that John Isner’s height (and the wingspan that comes with it) doesn’t play to his advantage based on his career. With an extensive record of wins against top-10 adversaries, his top ranking of No. 9 is certainly well-deserved.