of the USA is now the favourite to retain her Wimbledon title, as the world number 1 is the only top 20 player to reach the Semi Finals at SW19 this year.
In the 4th round Serena beat the 2004 champion Maria Sharapova 7-6 6-4, then in the Quarter Finals she beat the Chinese number 1 player Na Li 7-5 6-3.
Last year Serena won the title for the 3rd time in her career, when she beat her older sister Venus in the final 6-2 7-6, the sisters then teamed up to win the doubles title and they are now ranked number 1 in the world in doubles.
Venus however suffered a shock quarter final defeat yesterday, she had been in the final at Wimbledon 8 times in the last 10 years, the sisters are still in the doubles tournament however.
Earlier this year Serena won the Australian Open in Melbourne for the 5th time in her career beating Justin Henin of Belgium in a tight 3 set final.