Esther Vergeer, the retired Dutch wheelchair tennis star who had a winning streak of 470 matches during her record-breaking career, has been diagnosed with breast cancer.

Vergeer announced the diagnosis in a tweet Wednesday, saying her “full focus will be on the treatment and healing of the cancer. Full of positive energy and with the support of my family, friends and colleagues, I will go for it. I am sure I will get through this!”

The 38-year-old Vergeer has used a wheelchair since she was 8, when an operation to correct hemorrhaging around her spinal cord left her paraplegic.

-FILE- In this Friday, Sept. 7, 2012, file image Esther Vergeer of the Netherlands plays a return to Aniek Van Koot during the gold medal match during the women's wheelchair tennis final at the 2012 Paralympics games.Esther Vergeer, the retired Dutch wheelchair tennis star who went on a 470-match winning streak during her record-breaking career, has been diagnosed with breast cancer. (AP PhotoAlastair Grant, File)

-FILE- In this Friday, Sept. 7, 2012, file image Esther Vergeer of the Netherlands plays a return to Aniek Van Koot during the gold medal match during the women's wheelchair tennis final at the 2012 Paralympics games.Esther Vergeer, the retired Dutch wheelchair tennis star who went on a 470-match winning streak during her record-breaking career, has been diagnosed with breast cancer. (AP PhotoAlastair Grant, File)

She took up wheelchair tennis and strung together a list of titles that led Richard Krajicek, the 1996 Wimbledon champion, to call her “perhaps the most successful sportsperson of all time.”

Her winning streak lasted from 2003-2012. During that time she won 25 Grand Slam titles, four Paralympic singles gold medals and three doubles golds.

Vergeer is the leader of the Dutch team for the Tokyo Paralympics Games, which open on Aug. 25.

-FILE- In this Monday Feb. 6, 2012, file image Esther Vergeer, wheelchair tennis player, of The Netherlands, arrives for the Laureus World Sports Awards in London. Vergeer, the retired Dutch wheelchair tennis star who went on a 470-match winning streak during her record-breaking career, has been diagnosed with breast cancer. (AP PhotoLefteris Pitarakis, File)

-FILE- In this Monday Feb. 6, 2012, file image Esther Vergeer, wheelchair tennis player, of The Netherlands, arrives for the Laureus World Sports Awards in London. Vergeer, the retired Dutch wheelchair tennis star who went on a 470-match winning streak during her record-breaking career, has been diagnosed with breast cancer. (AP PhotoLefteris Pitarakis, File)

More AP sports: https://apnews.com/apf-sports and https://twitter.com/AP_Sports