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Alongside a photo of himself wearing the shirt, Ohanian wrote, \"Onward. 👏 Thanks for helping pick my shirt, IG squad. If you want your own, ask @nike.\"

\"PHOTO:
Brandon Malone/AFP via Getty Images
PHOTO: People sitting in the box for Serena Williams, including her husband Alexis Ohanian, left, and coach Patrick Mouratoglou, center, cheer her on during her women's singles match at the Australian Open in Melbourne on Feb. 16, 2021.
>

The gesture in support of Williams comes after the debate on the greatest of athlete of all time was recently reignited online after Tampa Bay Buccaneers quarterback Tom Brady took home his seventh Super Bowl win earlier this month.

Many were quick to call the NFL legend the \"G.O.A.T.\" or \"Greatest Of All Time\" after the win, but others were quick to point out that Williams has 23 Grand Slam singles titles.

Serena Williams has 23 Grand Slam titles. https://t.co/VCsIzh2ODa

— reggie (@kidnoble) February 8, 2021

Ohanian, who is always outspoken when it comes to praising his wife, made his stance clear on the greatest athlete debate with his T-shirt.

Williams also shared a post after her win on Tuesday, in which she wrote, \"The smile says it all. This proud mama marches on.\"

View this post on Instagram

A post shared by Serena Williams (@serenawilliams)

In a post-game interview, she described her win as \"the best match\" she played during the tournament.

The tennis star is currently vying for her 24th Grand Slam singles title, which would tie her with the current record-holder, Margaret Court. She will face off against Osaka on Thursday, in what will be their fourth matchup.

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