Battle of Williams sisters
Serena Williams overcame her sister Venus at the US Open to move within two victories of her first calendar Grand Slam.
The world number one held her nerve to win 6-2 1-6 6-3 and reach the semi-finals in New York.
Serena, 33, will play unseeded Italian Roberta Vinci in the last four on Thursday.
The American could become the first player to win all four majors in the same year since Steffi Graf in 1988.
Venus, 35, was playing in the fourth round at Flushing Meadows for the first time since 2010, but threatened to derail her sister’s grand ambitions.
The 23rd seed battled back to force a final set, only to see younger sister Serena capitalise on an early service break and claim her 33rd straight win at the Slams.
story of sisters
As professionals, the sisters first met in a grand slam — the second round of the 1998 Australian Open, with Venus winning in straight sets. Serena now holds a 16 -11 edge over Venus in overall competition.
But that hardly means playing Venus is a stress-free affair for the six-time U.S. Open champion.
“The only player in the draw I don’t want to play, not only because she’s my sister, but for me she’s the best player,” the 33-year-old Serena said of Venus, a former No. 1 herself who is now ranked No. 23 in the world.
“She has beaten me so many times,” added Serena, who has now defeated her sister 16 times in their previous 27 meetings, including nine of their previous grand slam encounters and three out of five U.S. Open battles.