(Reuters) - Grand slam champion Sofia Kenin has withdrawn from the upcoming U.S. Open after testing positive for COVID-19 multiple times despite being vaccinated, she said on Wednesday.

Kenin, the 2020 Australian Open winner who was seeded fifth at the tournament in New York, adds her name to a long list of top players unable to compete including Serena Williams, Roger Federer, Rafael Nadal and Simona Halep.