Serena Williams made a cameo at the Ultimate Tennis Showdown on Monday and took her turn in the commentary booth while good friend Grigor Dimitrov took on Cristian Garin in the second match of the day.

Though the Bulgarian lost the exhibition match against the Chilean youngster, he nonetheless managed some fun with Williams during a changeover as the 23-time Grand Slam champion teased him about his decidedly straightforward UTS nickname, Grigor.

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(For reference, world No. 2 Daniil Medvedev has opted to go by "The Chessmaster" and Garin chose "El Tanque.")

"We're thinking about changing it to 'The G-Force' or 'The Bulgarian,' but we're excited to see you go out there and crush it," Williams said, later adding, "May 'G-Force be with you."

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Earlier in the day, the former world No. 3 fielded nickname suggestions from fans that included "Lord Handsome."

"I don't think I'd say no to that," he laughed.

Dimitrov is heading into Roland Garros with a 3-4 record on clay, with his best result coming at the Rolex Monte-Carlo Masters, where he fell to Rafael Nadal in the round of 16. Roland Garros is the only major tournament where he is yet to reach the semifinals.