Martina Navratilova says she is clear of cancer. (More Tennis News)

The tennis Hall of Famer announced the news on Monday on Twitter after what she said was a full day of tests at Memorial Sloan Kettering Cancer Center.

“Thank you to all the doctors, nurses, proton and radiation magicians etc- what a relief,” she wrote.

Navratilova, 66, revealed she had been diagnosed with throat cancer and breast cancer in January and that she would begin treatment that month. She had been diagnosed with a noninvasive form of breast cancer in 2010 and had a lumpectomy.

The 18-time Grand Slam singles champion had noticed an enlarged lymph node in her neck in November and a biopsy revealed the early stage throat cancer. But Navratilova felt well enough to return to her TV work with the Tennis Channel by the Miami Open in March.