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Tennis aces score on court, reap reward in wealth: The 10 wealthiest players

Serena Williams with the winner's trophy, after her women's singles final victory over Spain's Garbine Muguruza at the 2015 Wimbledon Championships in London, on July 11, 2015.

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On Monday, the U.S. Open—the crown jewel of grand slam tennis and a big money maker for the metro New York City region—kicked off, featuring some of the biggest names in the sport. The event itself is said to dwarf the Super Bowl in its regional economic impact, bringing in more than $700 million.

For the athletes appearing on its courts, the tournament is widely considered to be the most lucrative in terms of prize money, beating out awards at its Australian and French counterparts, as well as Wimbledon.

Read MoreWho's the most marketable tennis player?

The men's and women's singles champions at the U.S. Open 2015 will play for $3.3 million in prize money, not including the possibility of additional earnings. Yet according to Wealth-X Professional, they probably don't need the money. The wealth intelligence site compiled a list of the top 10 wealthiest (active) players, according to their net worth, which CNBC compiled in the following slides.

By Carolina Cruz, special to CNBC.com
Posted 31 Aug. 2015

Leon Neal | AFP | Getty Images