Serena Williams is making headlines for her participation in the US Open 2013, and some analysts suggest Belarusian tennis star Victoria Azarenka might be her newest rival.

"Serena's new foe from afar is Victoria Azarenka, a Belarusian with a booming game and a shrieking grunt that would have her instantly cut in any Broadway audition room. But what matters is this: these two have a genuine rivalry, with Serena storming back from a third-set deficit in the final to beat Azarenka for the U.S. Open title a year ago," the Daily Beast writes.

"Since then, Vika (with boyfriend Redfoo, formerly of LMFAO, watching courtside) has notched two wins against the perennial powerhouse, including a recent slugfest in the Cincy final just over a week ago that has tennis insiders drooling for a rematch final-and perhaps a few across-the-net, New York-tough glares."

Serena Williams' coach and rumored boyfriend Patrick Mouratoglou touted her performance in the US Open 2013, saying "#serena broke 100 victories with tonight's win since we work together."

But some say the X-factor in Serena Williams' quest for a fifth U.S. Open could be the presence of her parents, leaving fans wondering how her relationship with coach and rumored boyfriend Patrick Mouratoglou will affect her chances.

Richard Williams, Serena Williams' father, boycotted attending the Wimbledon 2013 tournament, where Serena Williams had an early dismissal, because he isn't happy she's dating Patrick Mouratoglou - the most likely cause of his discontent lies in the French coach's marital status, AOL Entertainment reports.