Amelie Mauresmo took over the No. 1 spot in the WTA rankings from Kim Clijsters on Monday. Only 15 women have held the top position since the rankings began in 1985. Mauresmo also was briefly No. 1 in 2004. Mauresmo and Clijsters missed last week's Pacific Life Open in Indian Wells, Calif., which was won by Maria Sharapova.