Esther Mary Vergeer is a Dutch former professional wheelchair tennis player. Vergeer won 43 major titles, 23 year-end championships, and seven Paralympic gold medals. She was the world No. 1 in women's wheelchair singles from 1999 to her retirement in February 2013. Vergeer went undefeated in singles for ten straight years, ending her career on a winning streak of 470 matches. She has often been named the most dominant player in professional sports.