Last year he made $48 million, making him the 2nd highest-earning tennis player in the world and the 13th highest-earning athlete.
Source: Forbes
On the court, Djokovic has made over $79 million in career winnings, including $6.9 million in 2015 alone.
Source: ATP World Tour
Adidas (shoes), luxury car brand Peugeot, luxury watch brand Seiko, Australian winery Jacob's Creek, and Uniqlo are just some of his biggest sponsors.
Source: Forbes
In 2013, he wrote a nutrition and lifestyle book called "Serving to Win: The 14-Day Gluten-Free Plan for Physical and Mental Excellence" about the diet that changed his career.
Source: Amazon
Djokovic has put some of that money to use, buying a two-bedroom apartment in Monte Carlo, one of the most expensive real estate markets in the world.
Source: Wall Street Journal
He bought a luxurious Manhattan 60 yacht for $2.5 million in 2009. It seems he has since sold it, however.
Source: NovakDjokovic.com, Wall Street Journal
He owns a chain of restaurants called Novak Cafe & Restaurant with locations in Belgrade, New Belgrade, and Kopaonik.
Source: Novak Cafe
In 2013, it was reported that Djokovic was buying the world's supply of donkey cheese, which costs $500 per pound, for his restaurants. It turned out to be falsely reported — a farmer was offering Djokovic and his restaurant exclusive access to the cheese. Djokovic said he was considering the offer in 2014.
Source: Daily Mail, New York Times, The National
Djokovic drives cars from his sponsor Peugeot, and also enjoys cars from Audi, BMW, and Mercedes. However, in 2014, he said he would give up sports cars as he had a child on the way.
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Source: NovakDjokovic.com, Daily Mail
Djokovic likes to arrive in style, showing up to the 2015 Boodles Wimbledon warm-up event in a helicopter.
Source: Daily Mail
He's a fixture at big tennis galas, and is admittedly a fan of blazers and "elegant jackets."
Source: Wall Street Journal
Djokovic and his family own a company called Family Sport which, according to the company website, organizes sporting events and offers catering services.
Source: Family Sport
In 2009, Family Sports bought the Dutch Open and turned it into the Serbia Open. It lasted four years before being bought back by the ATP.
Source: Family Sport, Tennis Now
Djokovic uses a $75,000 pressure chamber called the CVAC Pod that is supposed to increase muscle tone, decrease lactic acid, and stimulate stem cell production.
Source: Wall Street Journal
Djokovic takes his diet very seriously, and recently released his own nutritional food line called "Djokolife."
Djokovic and his wife, Jelena, help run the Novak Djokovic Foundation, which aims to improve early childhood education. So far, the organization has donated over $3.4 million to its cause.
Source: Novak Djokovic Foundation
In 2014, Djokovic donated the $750,000 he won from the Italian Open to relief efforts for a flood in Serbia.
Source: ESPN