A look at wins by Venus and Serena as well as an impressive showing by Simona Halep.
Tennis Channel

NEW YORK — In the early stages of another comeback from another wrist injury in February, 2009 U.S. Open champion Juan Martin del Potro sounded almost desperate. “I need to improve my backhand as soon as I can.”

Del Potro was protecting his surgically repaired left wrist and therefore slicing balls defensively on the backhand with one hand, presenting a Steffi Graf-like game plan: Float the ball low and deep off the backhand, pounce when you can with a…