Serena Williams Boyfriend 2013: Couple Getting Serious? Patrick Mouratoglou Posts Photos With Girlfriend

Patrick Mouratoglou, Serena Williams' coach and rumored boyfriend, posted a picture of himself standing next to her at an event, leaving many wondering if the couple is getting more serious and being more open about their relationship.

The French tennis coach's Facebook account is filled with photos of him and Serena Williams and often boasts her accomplishments.

But Serena Williams might not be feeling the same way about him.

Serena Williams dished out in an interview with "CBS This Morning" that she doesn't "mixbusiness with pleasure" when asked about her coach and rumored boyfriend Patrick Mouratoglou, leaving fans wondering if she's embarrassed about the relationship.

Regardless, Serena Williams is fresh off of a US Open victory and is turning 32 on September 26 - many wonder if she'll celebrate her special day with Patrick Mouratoglou.

But Serena Williams mentioned in an interview with USA Today in June that she shares "something special" with her coach and rumored boyfriend Patrick Mouratoglou.

While Patrick Mouratoglou is currently in a divorce case with his ex-wife Clarisse Mouratoglou, he is rumored to be dating Serena Williams very seriously and has been noted for improving her tennis career. Serena Williams recently won her fifth US Open title and had a stellar performance at the French Open earlier this summer.

Earlier this month, Patrick Mouratoglou touted her performance in the US Open 2013, saying "#serena broke 100 victories with tonight's win since we work together."