Serena Williams of the U.S. is congratulated by Caroline Wozniacki of Denmark after their WTA Finals singles semi-final tennis match at the Singapore Indoor Stadium October 25, 2014. REUTERS/Edgar Su
IN PHOTO: Serena Williams of the U.S. is congratulated by Caroline Wozniacki of Denmark after their WTA Finals singles semi-final tennis match at the Singapore Indoor Stadium October 25, 2014. Reuters

BFFs tennis superstars Serena Williams and Caroline Wozniacki have been spotted several times having a great time since the end of the WTA Tour season. Just recently, two of the best tennis players took to social media to showcase their bikini bodies.

Last week, Wozniacki ran and finished the New York Marathon and then was was seen watching a New York Knicks basketball game with the world no. 1 Williams on Tuesday. Apparently, the two top ten tennis players are enjoying each other's company as once again, they were spotted hanging out by a pool at taking selfies together.

Serena Williams posted a couple of photos on Instagram with Caroline Wozniacki as they were hanging out by the pool. Some shots show the two wearing bikinis while frolicking under the sun. Wozniacki, also posted her share of sexy selfies on Instagram with the caption, "Life is good! #pooltime #nofilter." Williams who finished as the world no. 1 this season and the former world no. 1 Wozniacki were joined by the pool with a pair of British racing drivers, Will Stevens and Paul Rees.

Meanwhile, the 33-year-old 18-time Grand Slam champion took part in a question and answer session on Twitter, where she was asked if she's interested to run the New York Marathon after her BFF Wozniacki successfully finished the marathon last weekend. Jokingly, the American tennis player said that her "ass was too big" to run, which made headlines and huge response from her Twitter followers.

Serena again tweeted:

Ok everyone. Tomorrow I am doing a sprint triathlon with @CaroWozniacki The only problem is I don't swim or run....

— Serena Williams (@serenawilliams) November 8, 2014

In the same Q&A session, Serena revealed to her fans that she "desperately" wants to settle down and have a family, and her time will eventually come. When asked if she is single, she responded, "not by choice." Furthermore, Serena claimed that she would be an actress if she wasn't an athlete and opened up about other topics including, what her favourite snacks are, what she loves to do in her spare time, and her worst habit, which is "Looking after people before putting myself first."