As sought-after as they are on a tennis court and off it, Serena Williams and Novak Djokovic are also promising guaranteed returns on the Alt Exchange. The 23-time Grand Slam champion and the current men’s World No.1 have topped the recently sold tennis cards or listings on the Alt Exchange.

For the uninitiated, Alt Exchange lets a client or a buyer exchange altcoin-bitcoin pairs, and the two tennis superstars feature among the highly priced and top trending cards on the Exchange.

Serena Williams’ tennis card was priced at $3,110, while Novak Djokovic’s was $4,500

The Serena Williams listing, which was sold on May 5, was priced at $3,110, while the Novak Djokovic card, also sold the same day, was valued even higher at $4,500.

The top sold listings that have been featured on the Exchange’s official Instagram page have drawn a reaction from Serena’s self-made investor husband Alexis Ohanian.

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The Instagram post featuring the listings runs with the tagline, “Check out some of today’s listings on the Alt Exchange! Which card would you choose?”

Ohanian, who is known to trade in bitcoins and altcoins, responded to the post with, “O Hey Cap!”

Both Serena and Novak Djokovic are making comebacks at Italian Open

Both Serena and Djokovic are coming off breaks and would mark their return to competitive action at the ongoing Italian Open.

The Serb, who suffered two unsuccessful campaigns on clay at the Monte-Carlo Masters and the Serbia Open, chose not to defend his 2019 title at the Madrid Open this year.

After falling to a shocking loss to British No.1 Dan Evans in Monte Carlo, the reigning Australian Open champion suffered his first defeat in years in his homeland in an epic semi-final in Belgrade against Russian Aslan Karatsev.

Serena, on the other hand, hasn’t featured in any Tour event since her crushing semi-final loss to eventual champion Naomi Osaka at the Australian Open.

Both are coming into the tournament in the quest of finding their best form on clay before the action shifts to Roland-Garros.

Read More: “Takes So Much Time and Dedication”: Serena Williams Believes She Won’t Be Featuring in Movies

In a rerun of marathon five-setter in the third round at Melbourne Park, Djokovic will open his Rome campaign against American Taylor Fritz on Tuesday.