The former world No. 1 has pulled the plug on a disappointing season to rest and rehabilitate.
Keep up with the action on a busy Tuesday at the Billie Jean King National Tennis Center with the Tennis Now Live Blog.
Halep calls Williams "the only one player I learn from."
The Aussie hasn't taken a shot at John McEnroe, but one other coach wasn't so lucky.
Stan the demolition man strikes again.
Former US Open champion says his wrist is largely pain-free.
Keep up with all the action from Day 8 of the U.S. Open with the Tennis Now live blog.