ATP star Jack Sock and TikTok elite Alex Presley took part in a tic-tac-toe challenge for the ages, with a setup against a tennis court's back fence.

With tennis balls and footballs flying, the duo found the fun in the COVID-19 era's more mundane times. Presley is actually famous in part for his family's "Quarantine Olympics."

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Presley's more than two million TikTok followers surely enjoyed the video, with more than 26,000 likes, twice Sock's take on Instagram. Ultimately Sock reigned victorious, delivering a backward, between-the-legs shot at top-right that gave him three hits in a row for a stylish tic-tac-toe.

Sock, a career-high No. 2 in doubles and No. 8 in singles, including ATP Finals appearances in both disciplines, is on the bound with his singles career. Look for a strong push on North American hard courts, wherever tennis is happening in 2021.