Russian tennis superstar Maria Sharapova and her boyfriend, Bulgarian tennis pro Grigor Dimitrov, are said to be having some trouble these days as their romantic relationship is reportedly on the rocks. According to reports, both athletes have un-followed each other on the social media platform Twitter, which leads many to believe that there's trouble in paradise.

Sharapova's posts on Twitter lately were all about her business ventures, Sugargoop and Sugarpova. Because of this, rumors surfaced saying that the tennis superstar might have been too busy to spend time with Dimitrov, prompting reports that the latter might be losing grip on their relationship.

Reports also claim that the 27-year-old tennis icon has been spending her days buried in her business endeavors, and that she did not spent what little free time she had with her beau before the US Open 2014, which started last Sunday, August 25th. The 23-year-old Dimitrov, on the other hand, was said to have been very endearing, telling fans during a Nike chat session that he would love to play alongside his girlfriend for a mixed doubles competition.

Sharapova, on the other hand, reportedly said that she would only play with John McEnroe, and even went as far as asking if they could bring him back so he could play with her.

The professional tennis couple is currently in New York City for the 2014 US Open, but have been currently silent about the rumors surrounding them. Presently, Sharapova ranks as number five in the world for women's, while her boyfriend Dimitrov, currently ranks eight for men's, who is facing the possibility of being pitted up against Roger Federer if he makes it to the fourth round of the US Open.