It was the first day of the Mubadala World Tennis Championship (MWTC) on Thursday night at the International Tennis Centre at Zayed Sports City.

And ICONIC Williams sisters, Serena and Venus, took the centre stage by playing a stellar match for the 5,000 spectators in attendance.

Sister-act in Abu Dhabi

Serena????Venus #MWTC pic.twitter.com/R8R2IHgFOn

— Reem Abulleil (@ReemAbulleil) December 27, 2018

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While it was Venus who came on top by winning the exhibition match, it was actually Serena’s 15-month old daughter, baby Olympia, who stole the show.

Serena’s husband, Alexis, posted this super adorable video of baby Olympia clapping for both her mum and aunt during their match on his Instagram.

And it’s legit the cutest thing ever

According to reports, Serena was at the baseline when she spotted her daughter clapping and immediately told Venus: “she’s clapping for you”.

Serena cracked up when she saw Olympia clapping: She was clapping for you she tells Venus ????#MWTC pic.twitter.com/s7WIjpvYfg

— Reem Abulleil (@ReemAbulleil) December 27, 2018

In a press conference later, Serena gushed about the moment saying:

“That’s a classy baby you know, she applauds both mommy and my opponent who happened to be her auntie. That was the highlight, seeing her clap, it was so cute.”

The crowd favourite #WilliamsSisters put on a powerful performance tonight, keeping fans at the edge of their seats! @venuseswilliams takes back with her a win from her first time in #AbuDhabi (4-6, 6-3, 10-8) against @serenawilliams. #MWTC pic.twitter.com/Vfj3gpRwOv

— MWTC (@MubadalaTennis) December 27, 2018

Awwwwwww