"There is no frustration (at rankings slip). It's just tough," said Wawrinka, seeded 23rd this year. "But again, I knew from the beginning that it will take a long, a lot of time to get back. I knew that from the surgery that it will take a year at least to get where I want to be. I wasn't at my best, he played with a lot of spin.

Source: Egypt Today May 28, 2018 18:22 UTC