Serena Williams powers past sister Venus to win the US Open quarter finals 6-2, 1-6, 6-3…
Serena Williams is one step closer to being the first women to win all four major singles titles in a season since Steffi Graff in 1988.
The difference? Steffi was 19. Serena is 33!
GIF: Venus hugs Serena pic.twitter.com/xpIo7aOMvf
— The Cauldron (@TheCauldron) September 9, 2015
