Serena Williams celebrated her 32nd birthday last week, but rumors are sparking the tennis star might not have spent her special day with her coach and rumored boyfriend Patrick Mouratoglou.

Shortly after the U.S. Open, Serena Williams denied rumors surrounding her relationship with her coach saying "You just do not mix pleasure with business, I firmly believe in not mixing pleasure with business."

A hockey player named Dan Ogee posted a photo of a trophy he appears to have won and tagged the US Open star in his post, saying "my trophy is bigger than yours."

Serena Williams responded, saying "Wow can I have it?" and he answered back, saying "Nope, but you can drink from it."

Perhaps the Twitter back-and-fourth exchange might have made Serena Williams' coach and rumored boyfriend Patrick Mouratoglou jealous?

Serena Williams has spoken about all about her personal and social life on Twitter, except for her coach and rumored boyfriend Patrick Mouratoglou.

Serena Williams and her coach Patrick Mouratoglou have long been rumored to be dating, but one website suggests the couple might not have ever dated.

"The pair have never openly admitted to being anything more than player and coach, but the media and especially the tennis writing press have largely ignored this fact and assumed that they are a couple, to the point that there are now rumors about the so-called 'couple' having split up," SteveGTennis.com reports.