She said it was time for her “to move forward.”
World No.2 Karolina Pliskova hires Daniel Vallverdu as coach
"The years are passing, and she's not getting any younger," said 1994 Wimbledon champion Conchita Martinez, who coaches 2016 U.S. Open runner-up Karolina Pliskova. "But she has a shot."
US OPEN '19: What to know, from Serena Williams to the Big 3