Knee surgery knocked Roger Federer out of this week's US Open.
The Swiss superstar still emerges as a major winner.
Azarenka: US Open Fan Policy is Bizarre
The 40-year-old Federer tops Forbes list of highest-paid tennis players.
View Forbes highest-paid tennis player list here.
Over the past 12 months, Federer ruled the tennis world with pretax earnings of $90.6 million with nearly $90 million of that coming from endorsements, Forbes reports.
Reigning US Open and Australian Open champion Naomi Osaka ranks second behind Federer with $60.1 million in earnings; Forbes reports 90 percent of Osaka's earnings came through off-court contracts.
Twenty-three time Grand Slam champion Serena Williams, who is out of the Open continuing recovery from a torn hamstring she suffered at Wimbledon, is third with $41.8 million.
World No. 1 Novak Djokovic ranks fourth on Forbes' list with $38 million.
Rafael Nadal, who withdrew from the US Open due to a chronic left foot injury, completes the top five with $27 million in earnings over the past year.
Forbes reports: "Collectively, tennis’ ten highest-paid players made $320 million over the last 12 months, down 6% from last year’s total of $340 million in large part because the pandemic eliminated opportunities for players to collect both prize money and appearance fees."
This year, US Open singles champions will earn a check for $2.5 million.
Forbes Top 5 Highest-Paid Tennis Players List
1. Roger Federer $90.6 million
2. Naomi Osaka $60.1 million
3. Serena Williams $41.8 million
4. Novak Djokovic $38 million
5. Rafael Nadal $24 million
Photo credit: Mark Peterson/Corleve