See which pros made SI's Fittest Athletes list

Sports Illustrated has released a list of the world's fittest 50 men and women athlete's across all sports. This year, some tennis stars managed to make their way in, with three women and two men making the cut.

On the men's side, of course, are Rafael Nadal and Roger Federer, at No. 23 and No. 3 respectively. Both players have been the most dominate players on tour this year after recovering from an injury-riddled 2016. Only Lebron James and Cristiano Ronaldo are ahead of Federer.

On the women's list, new mom Serena Williams enters the Top 10 at No. 9, while Garbine Muguruza makes it at No. 35. The athletic Spaniard won Wimbledon and become world No. 1 this summer.

Sloane Stephens managed to sneak onto the list at No. 40. She just won the US Open after taking almost a year off from tennis with a foot injury.