Tennis players are getting into running. On Nov. 2, Caroline Wozniacki will run the TCS New York City marathon after finishing second at the 2014 U.S. Open in early September. The World's No. 1 Tennis Player, Serena Williams, opts for a shorter distance and will host a 5K on Dec. 14 in Miami. Two-time Olympian Shannon Rowbury of the Nike Oregon Project is slated to join the race, according to Runner's World. 

The Serena Williams Ultimate Run will have a 5K, Quarter Marathon race of 6.55 miles and separate race for children. 

This is not the first time Rowbury has helped out a fellow celebrity. Back in Aug. 2013, Rowbury was giving training advice to actress Lindsey Lohan.