Serena Williams' hunt for history hinges on regaining edge in one area.
Former world No. 1 will work as guest analyst for ESPN's second-week US Open coverage.
Stefano Tsitsipas texted Naomi Osaka for more information.
Naomi Osaka was waiting for someone to speak up. Then she spoke.
Elise Mertens' double bubble approach key to her success.
Bookmakers and bettors favor Novak Djokovic to win fourth US Open crown.
Venus Williams channels her inner Johnny Mac in preparation for US Open.
