The U.S. Open's Highest-Paid Golfers

Some of the highest-paid athletes in the world are at Chambers Bay for the 2015 U.S. Open.

According to Forbes, six of the top 100 athletes are golfers. The 10 biggest earners in the sport raked in approximately $271 million in combined prize money, appearances, endorsements and golf course design fees during the year ended June 1, 2015.

The U.S. Open, which started play Thursday, is the second Major golf tournament each year. Here are the top six earners competing for the championship.

1. Phil Mickelson

Total earnings: $50.8 million

Salary: $2.8 million

Endorsements: $48 million

Mickelson, 45, typically makes more than $40 million each year from appearances and endorsements. His sponsors include oil giant Exxon Mobil (NYSE:XOM), accounting firm KPMG and British bank Barclays (NYSE:BCS). Callaway Golf (NYSE:ELY), Rolex and Amgen (NASDAQ:AMGN) also sponsor the five-time Major champion.

Forbes listed Mickelson at No. 8 in the magazine’s annual ranking of athletes. He ranks just behind Kevin Durant, who plays for the NBA’s Oklahoma Thunder.

2. Tiger Woods

Total earnings: $50.6 million

Salary: $600,000

Endorsements: $50 million

Woods, the winner of 14 Majors during his career, has struggled on the course amid elbow and back injuries. He made the cut at just seven out of 13 tournaments in 2014 and the first half of 2015. As a result, nearly all of Woods’ earnings came from endorsement deals with Nike (NYSE:NKE) and new sponsors MusclePharm and Hero, one of the world’s largest motorcycle manufacturers.

Woods also jumped into the business of course designing. His first course, located in Mexico, opened last year. A Woods-designed course near Houston is slated to open in October.

3. Rory McIlroy

Total earnings: $48.3 million

Salary: $16.3 million

Endorsements: $32 million

One of golf’s young stars, the 26-year-old McIlroy has risen to the top of the World Golf Rankings. He led all golfers with $16.3 million in prize money, thanks to two Major championships and a total of five PGA wins.

McIlroy wears Nike gear on the course, and this year, he will replace Woods as the featured golfer on Electronic Arts’ (NYSE:EA) PGA Tour videogame franchise. Other partners include Bose, Upper Deck and Omega watches.

4. Justin Rose

Total earnings: $20.2 million

Salary: $8.2 million

Endorsements: $12 million

Rose emerged as a big player in endorsement deals following his victory at the 2013 U.S. Open. His sponsor portfolio includes sportswear giant Adidas and its golf subsidiary, TaylorMade. The U.K. citizen also has a deal with British Airways.

5. Jordan Spieth

Total earnings: $19.8 million

Salary: $8.8 million

Endorsements: $11 million

Spieth, ranked No. 2 in the world, is looking for his second Major championship this year. With a record-breaking performance at the Masters, Spieth became the second-youngest golfer behind Woods to ever win the tournament. The green jacket was worth $1.8 million in winnings, plus big bonuses from Spieth’s sponsors.

The timing was perfect for Under Armour (NYSE:UA), which signed Spieth to a 10-year contract extension in January. The Texas native also has an endorsement deal with Dallas-based AT&T (NYSE:T), as well as Titleist and Rolex.

6. Billy Horschel

Total earnings: $19 million

Salary: $16 million

Endorsements: $3 million

Horschel, 28, scored a $10 million bonus by winning the FedEx (NYSE:FDX) Cup last year. He won two tournaments during the FedEx Cup playoffs, including the Tour Championship.

Earlier this year, the Florida-born golfer added Toyota’s (NYSE:TM) Lexus brand to his sponsor list, which already included Titleist and Ralph Lauren (NYSE:RL).