Serena Williams, Maria Sharapova and Victoria Azarenka are all contestants in ESPN's ESPY Award poll to evaluate the best female tennis player, leaving tennis fans wondering who Patrick Mouratoglou will vote for.

The French tennis analyst, who coaches Serena Williams and is rumored to be in a relationship with her, is expected to vote for his trainee. However, online votes for players remain anonymous and are not publicized by ESPN, so it won't be known who Patrick Mouratoglou will end up voting for.

The ESPY Award is presented annually by ESPN and awards the best players, teams and other sporting-related groups based on popular voting and fan support.

And now, Serena Williams and Maria Sharapova are once again in a head-to-head competition to win the accolade.

Patrick Mouratoglou has not commented on intents to vote or who he would vote for.

It is rumored that Serena Williams' romantic relationship with her coach was the reason for Patrick Mouratoglou's split from his ex-wife, with whom he shares two daughters.

But neither has commented on the love affair or the divorce.

Serena Williams currently owns an apartment in Paris, where she joined Patrick Mouratoglou's tennis academy a year ago, and stays there on a frequent basis - the couple has been spotted shopping and spending romantic walks together throughout the city.

Rumors surrounding the couple sparked after photographers witness Serena Williams with her hand inside Patrick Mouratoglou's back pants pocket  on a Paris street. Since then, multiple reports have speculated that the two are a couple and that they are keeping their relationship clandestine.