WATCH: When Grigor Dimitrov was trolled with ex-girlfriend Nicole Scherzinger's song at Stuttgart Open

Grigor Dimitrov dated Nicole Scherzinger, the lead vocalist for 'The Pussycat Dolls' for a brief while, between 2015 and 2019. The relationship began right after Dimitrov's previous romantic tryst with Maria Sharapova ended.

During that time, in 2016, the Bulgarian was in action at the Stuttgart Open, where he took on former US Open champion Juan Martin del Potro in the Round of 32. Dimitrov was leading 4-3 in the first set when the stadium DJ decided to have a little fun at his expense.

'Don't Cha,' considered one of the biggest hits of The Pussycat Dolls, started blaring through the speakers, much to Dimitrov's surprise. Initially taken aback, the 32-year-old saw the humor in the situation and laughed along to the song, trying his best to keep a straight face and failing miserably.

Perhaps distracted by the moment, Grigor Dimitrov went on to lose the contest, falling 4-6, 3-6 in straight sets to the Argentine. The head-to-head between him and Del Potro is 6-2, with the latter winning their last encounter at the Sweden Open in 2017.

Nicole Scherzinger on relationship with Grigor Dimitrov: "It's good when you're both career-driven"

Nicole Scherzinger had opened up about her relationship with Grigor Dimitrov during the time they were together, stating that they were both busy with their own careers but still made time for each other.

The American was not too bothered by the fact that Dimitrov was very career-oriented; as someone with a similar mindset, she believed it was good that they were both like that.

"We've been together for quite some time now, so I'm just living in the moment and I'm happy. He's obviously busy as he's got his own career, but hopefully he'll come and visit me. We both travel a lot, but it's nice when we are able to make time (for each other). You appreciate it. It's good when you're both career-driven to have your own space to focus on your career and yourself," Scherzinger said.

Maria Sharapova, who dated Grigor Dimitrov before his relationship with Nicole Scherzinger, had a different view of her relationship with the Bulgarian. Pointing out how her presence at his matches probably meant she had lost her own early on, Sharapova emphasized that the relationship had to end predominantly because of the timing of their romance.

"I was supposed to be focused, getting prepared for my own matches, my own triumphs and defeats, on the largest stage of my career. I had been watching his match that day only because I’d lost early at those championships. So his good memory was my bad memory. What meant everything to him happened only because I had lost," Maria Sharapova revealed in her autobiography.