Reigning ATP Finals champion Stefanos Tsitsipas continues to have quite the mentor, in fellow Greek and back-to-back NBA MVP Giannis Antetokounmpo.

The two had previously hung out and talked tennis together, and now Tsitsipas has a physical reminder of his friend's mindset, having received a pair of shoes and a signed jersey with a special message on it.

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"Greatness is a life mission! Be Great!!" Antetokounmpo wrote on the jersey.

"I like your words," Tsitsipas said with his trademark earnestness. "This is, like, the best gift I have received in the last 10 years."

At No. 5 in the Race to London, Tsitsipas has the opportunity to, like Antetokounmpo, achieve repeat on-court greatness. But first, he opens up his Vienna campaign this week versus Jan-Lennard Struff.