LONDON — Two more wins.
That's all Serena Williams needs to complete the Grand Slam, a feat so rare that it has been accomplished just six times in tennis history.
Steffi Graf was the last winner, taking all four major tournaments in 1988.
Williams has already won four straight major titles, dating back to last year's U.S. Open, but she has never won all four in the same year.
"I don't know why it took me so long," Williams said after winning her quarterfinal match Wednesday night.
Williams would be the fourth woman to win the Grand Slam, joining Graf, Maureen Connolly and Margaret Court.