Karolina Pliskova is ranked No. 1, but she wants a title to go with it

As one of only 23 women who have been ranked No. 1 in the world since the Women's Tennis Assn. adopted a computerized system in 1975, Karolina Pliskova of the Czech Republic is in exclusive company. She's in another group she'd be happy to leave at the end of the U.S. Open: She's among the few...