Deposed Wimbledon champion Serena Williams has slumped 150 places in the world rankings to 175th - her lowest position since 1997.
The 29-year-old American only recently returned from injury and illness and was beaten by Marion Bartoli in the fourth round at the All England Club.
Caroline Wozniacki stays at the top of the rankings, while Wimbledon champion Petra Kvitova climbs one to seventh.
Laura Robson, who was beaten by runner-up Maria Sharapova, is up 69 to 185th.
Three Brits are ahead of Williams in the standings, with Elena Baltacha up 10 places to 58th, Anne Keovathong rising from 111th to 94th and Heather Watson staying 106th in the world.
In the men's rankings, Wimbledon champion Novak Djokovic has become the 25th man to take the world number one spot, while Andy Murray stays fourth after losing to Rafael Nadal in the semi-finals.
Jo-Wilfred Tsonga is up five places to 14th after his run to the semi-finals, while Australian teenager Bernard Tomic, beaten by Djokovic in the last eight, climbs 87 places to a career-high ranking of 71st.
Britain's James Ward is up five places to 187th, Daniel Cox rises two places to 271st and Liam Broady, beaten in the boys' final, climbs 78 places to 668th.