London: Wimbledon turned tennis upside down Wednesday when Novak Djokovic was named top seed above world number one Rafael Nadal while defending champion Andy Murray was seeded three over seven-time winner Roger Federer.

The All England Club awarded top billing to 27-year-old Djokovic, the 2011 champion and 2013 runner-up, by using its controversial grasscourt weighting system in deciding its seeds instead of sticking by the ATP world rankings.