Last month Serena Williams made history after she won a record-breaking 23rd Grand Slam title at the Australian Open.

And with the career feat behind her, she can showcase a rather playful side of her personality on the tennis court.

The Nike athlete made a surprise appearance Sunday night at Mission Dolores Park in San Francisco and stunned two fans by gatecrashing their match.

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Queen of the court: Serena William surprised fans on Sunday in San Francisco by asking to join in on a match

'I'm just having a stroll at night but I'm thinking about asking these guys to hit, just to see their reaction,' the Olympian explained while carrying her small dog wrapped in her arms as her fiance, Alexis Ohanian, filmed the moment on Snapchat.

'Can I play the winner?' she asked the pair of amateurs.

It took only a few short moments, but the men realized they were approached by one of the most famous athletes in the world. Naturally, they were stunned.

Gatecrasher: The star was taking a stroll and decided at random to surprise some amateurs

Unprepared: The Nike-sponsored star had on fashion boots and admitted should couldn't play for long without the proper footwear

'Oh my goodness, is that Serena?' one of the men said.

Though they tried to coax the tennis ace to break a sweat with on the court, she admitted that she didn't have the proper footwear to play.

Game changer! Serena's fans were delighted to meet the world-famous athlete

Serena was wearing a pair of fashion boots during the outing with her sweetheart and explained to the fans that she needed her Nike sneakers to play competitively, but agreed to hit the ball for a short, friendly set.

The 35-year-old later posed for pictures before heading off for the night.

Serena announced her engagement to Reddit co-founder Alexis Ohanian last year in December. The lovebirds have been quietly dating since fall of 2015.