BELINDA BENCIC IS PROVING THAT PRODIGIES CAN HAVE SECOND ACTS
NEW YORK—Belinda Bencic was in a rage. She had just dropped her serve for the first time against Donna Vekic, at an inopportune moment: 4-4 in the first set. Bencic had hit a forehand wide, a backhand into the net, and a backhand long. She…