Wawrinka played brilliant tennis and broke Nadal early in the first set.
He won five straight points to take the first set.
He kept up the high standard in the second set.
Nadal's back injury left him barely able to serve and he lost the second set.
Nadal somehow took the third set, but couldn't hold on in the next.
Alan White is a news editor for BuzzFeed News and is based in London.
Contact Alan White at email@example.com.
Got a confidential tip? Submit it here.