Serena Williams Australian Open: Boyfriend Patrick Mouratoglou Predicts Victoria Azarenka Rivalry? French Tennis Coach Says ‘They’re Not Real Friends’

Serena Williams' coach and rumored boyfriend Patrick Mouratoglou mentioned during a September interview that the American tennis star and Victoria Azarenka are "competing at the highest level," leaving many fans wondering if he predicted a rivalry during the Australian Open.

"Of course they have a good relationship, but it's difficult to have real friends," Mouratoglou said, according to ESPN.

"So, they're not real friends, but they appreciate each other, they're joking; they are friends, but as much as they can be because they're competing at the highest level."

Victoria Azarenka thinks her rivalry with Serena Williams is making her a better player and is looking forward to renewing it over the next four weeks at the Brisbane International and the Australian Open, DNAIndia.com writes.

But the upcoming tournament isn't the only thing Serena Williams' fans are talking about.

Serena Williams used the hashtag "#solo4life" in a recent Twitter post where she described a day spent to herself, leaving many fans wondering if she has ended her romantic relationship with rumored boyfriend and coach Patrick Mouratoglou.

"I have been having some quality time with myself today," she wrote in her post.

"Movies with myself and driving around with myself. I think I like me."

Despite the ominous message, the duo is leading in a poll released by TennisReporters.net asking fans who they believe is the best women's coach of the year with 53 percent of the votes.

The questionnaire was published by the website as the "2013 TR Annual Readers Poll."

Coach Carlos Rodriguez and Li Na came second to Patrick Mouratoglou and Serena Williams, earningjust over 22 percent of the votes.