 And from the William T. Grant Foundation, supporting research to improve the lives of young people at wtgrantfdn.org. This is Morning Edition from NPR News. I'm Leila Faldin. And I'm Steve Inskeep. Rafael Nadal is sitting out Wimbledon. He decided to focus on the Olympics in a few weeks. Novak Djokovic will play at Wimbledon after knee surgery. And Sports Illustrated's John Wertheim is on the line from London. John, welcome.