The 24-year-old Czech lobbed some praise in the direction of he vaunted sisters on Monday in New York.
"In the end, do you think I'm stupid?" says US Open semifinalist.
World No. 2 reveals one simple change that's contributed to her rise.
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.
