Serena Williams' hopes for a calendar Grand Slam are still alive. But it took three hard-fought sets to beat her sister Venus 6-2, 1-6, 6-3 and reach the US Open semifinals.

Serena is 19-12 all-time against Venus, including 11 wins in majors and a 7-2 mark in Grand Slam finals. There was a stretch from 2002-03 where the Williams sisters played each other in the ...

I try to hit her forehand. Doesn't work," he said. All eyes are on Serena Williams as she hangs up her racquet for the final time. Her retirement is making room for the next generation of leaders.