Few could have hoped for a better ATP Finals debut than what Grigor Dimitrov is enjoying. The world No. 6 started in London with a gritty three-set win over Dominic Thiem before dismantling David Goffin 6-0, 6-2 on Thursday.

He started the tournament on a light note as a guest reporter at the ATP Finals launch party. The winning seems to have the Bulgarian in an even better mood as he took a press prank orchestrated by Ryan Harrison really well.

All of that still isn't the only press fun Dimitrov has had. On Thursday he was asked this question:

"Last thing is, you are Bulgarian, you were born in Haskovo. You lived in Paris, are a resident of Monte-Carlo. You had a Russian girlfriend in Los Angeles. I'd like to know if you think about yourself as a citizen of the world?"

Dimitrov didn't miss a beat.

"You mentioned only one girlfriend in there? Man, c'mon."

The reporter was referring to Maria Sharapova, who Dimitrov dated for two years before starting a relationship with singer Nicole Scherzinger.

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Dimitrov has already qualified for the semifinals, but will face Pablo Carreno Busta in his last round-robin match on Friday.