Esther Vergeer of the Netherlands, who announced her retirement on Tuesday, won 21 consecutive Grand Slam titles in which she competed and finishes on a 470-match winning streak, dating back to a loss to a 6-4, 6-1 loss to Daniela di Toro on Jan. 30, 2003:

2002 Australian Open - def. Daniela di Toro, Australia, 6-2, 6-0.

2003 Australian Open - def. di Toro, 2-6, 6-0, 6-3.

2004 Australian Open - def. di Toro, 4-6, 6-3, 6-1.

2005 Australian Open - did not play.

2005 U.S. Open - def. Korie Homan, Netherlands, 6-2, 6-1.

2006 Australian Open - def. Jiske Griffioen, Netherlands, 6-4, 6-0.

2006 U.S. Open - def. Sharon Walraven, Netherlands, 6-1, 6-2.

2007 Australian Open - def. Florence Gravellier, France, 6-1, 6-0.

2007 French Open - def. Gravellier, 6-3, 5-7, 6-2.

2007 U.S. Open - def. Gravellier, 6-3, 6-1.

2008 Australian Open - def. Homan, 6-3, 6-3.

2008 French Open - def. Homan, 6-2, 6-2.

2008 U.S. Open - canceled, weather.

2009 Australian Open - def. Homan, 6-4, 6-2.

2009 French Open - def. Homan, 6-2, 7-5.

2009 U.S. Open - def. Homan, 6-0, 6-0.

2010 Australian Open - did not play.

2010 French Open - def. Walraven, 6-0, 6-0.

2010 U.S. Open - def. di Toro, 6-0, 6-0.

2011 Australian Open - def. Toro, 6-0, 6-0.

2011 French Open - def. Marjolein Buis, Netherlands, 6-0, 6-2.

2011 U.S. Open - def. Aniek van Koot, Netherlands, 6-2, 6-1.

2012 Australian Open - def. van Koot, 6-0, 6-0.

2012 French Open - def. van Koot, 6-0, 6-0.

2012 U.S. Open - event not competed.

2013 Australian Open - did not play.

The French Open began wheelchair competition in 2006.

Wimbledon does not hold a wheelchair singles competition.

The U.S. Open first held a wheelchair tournament in 2005.