Martina Navratilova revealed on Monday that she has been diagnosed with throat and breast cancer.

Navratilova told tennis.com that doctors discovered she had an unrelated form of breast cancer during throat examinations.

“This double whammy is serious but still fixable, and I’m hoping for a favorable outcome,” Navratilova said in a statement to the website. “It’s going to stink for a while, but I’ll fight with all have I got.”

According to the WTA, Navratilova underwent testing after noticing an enlarged lymph node in her neck in November. The former world No. 1 will reportedly begin treatment this month.

The 66-year-old was previously diagnosed with breast cancer in 2010.

Navratilova is one of the most accomplished tennis players ever. She won 59 Grand Slam titles in a career that spanned over four decades.

The 2022 Australian Open will require tennis players to be vaccinated against COVID-19.

"All the playing group understands it," Tennis Australia CEO Craig Tiley said. "Our patrons will need to be vaccinated, all the staff working the Australian Open need to be vaccinated."

Australia reports that nearly 85% of its population is fully vaccinated.

The vaccination requirement raises questions about whether world No. 1 men's tennis player Novak Djokovic will participate in the first grand slam of the season.

Djokovic has not publicly revealed his vaccination status, saying it's a private matter.

"I hope we get to see Novak," Tiley said.

The Australian Open is Djokovic's most successful grand slam event. He has won a record-setting nine tournaments.

Tiley said most of the men's and women's players are vaccinated. He said he expects Rafael Nadal, Serena Williams and others to be at the tournament, which starts in January.