Murray lost to Fabio Fognini earlier this week in the second round of the Italian Open, while Wawrinka became the latest high-profile casualty at the event after suffering a straight sets defeat to American John Isner on Thursday.
Djokovic is wary of the threat Wawrinka poses at Roland Garros having lost to the Swiss in the final two years ago. He also expects Briton Murray to be ready despite five victories...