July 11 , 2015 - Williams wins the Wimbledon title for the 6th time .
Is now on track for a calendar Grand Slam which has not been done since Steffi Graf in 1988 .
July 11 , 2015 - Williams wins the Wimbledon title for the 6th time , and is now on track for a calendar Grand Slam which has not been done since Steffi Graf in 1988 .