of the USA who is the world number 1 and defending champion at Wimbledon maintained her winning run at SW19 as she beat Na Li of China to book her place in the Semi Finals.
Serena won the match 7-5 6-3 and she will now be the favourite to defend her title.
Last year Serena won the title when she beat her older sister Venus 6-2 7-6 in the final, the sisters then teamed up to win the ladies doubles title together they are now ranked number 1 in the world in doubles.
Venus however suffered a shock defeat in straight sets in the Quarter Final yesterday.
Serena also won the Australian Open this year when she beat former world number 1 Justin Henin of Belgium in 3 tight sets.
Serena also won Wimbledon in 2002 and 2003 during which time she held all 4 majors simultaneously, which became known as the “Serena Slam”.