Martina Navratilova was diagnosed with throat and breast cancer.
The 18-time Grand Slam singles champion, who previously had breast cancer in 2010, will begin treatment in New York later this month.
Navratilova, 66, said both cancers were detected at an early stage.
“The double whammy is serious, but fixable, and I hope for a favorable outcome,” she said. “It will stink for a while, but I will fight with everything I have.”
Navratilova noticed an enlarged lymph node in her neck during November’s WTA Finals in Fort Worth, Texas.
A subsequent biopsy revealed stage one throat cancer.
During the tests, a lump was also discovered in her breast, which was later diagnosed as an unrelated cancer.
Navratilova was due to cover this month’s Australian Open from the Tennis Channel studio, but will instead make occasional appearances remotely.
The nine-time Wimbledon singles champion said she felt “helpless” after being diagnosed with cancer in 2010but decided to go public with the news to help other women with similar health issues.