Novak Djokovic
Novak Djokovic reacts during his match against Rafael Nadal.Reuters

World number two Novak Djokovic has been given top seeding at Wimbledon which starts June 23. Two-time champion Rafael Nadal is seeded second at the All England Club.

The Wimbledon uses its grass-court weighting system, instead of ATP rankings, due to which the world number one Nadal has been relegated to the second place. British Andy Murray is the  third-seed ahead of Roger Federer, who is fourth.

Australian Open champion Stanislas Wawrinka has also lost one place in the rankings as he will commence the tournament as fifth seed.

The All England Club calculates the rankings by taking 100 per cent points earned on 'all grass-court tournaments' in the past one year and 75 per cent points earned in the 'best grass-court tournament' a year before that.

"Wimbledon, they do what they want," Wawrinka said during the Queen's Club championship. "For me it's fine. I knew that with my past two years on grass I didn't have any results, so for sure my ranking will drop a little bit for the seeding. At the end of the day, it doesn't change much. You have to play well. You have to start the tournament well if you want to go far, and that's simple."

Czech Republic's Tomas Berdych is seeded sixth, while David Ferrer of Spain is seventh followed by big-server Milos Raonic of Canada and Japanese Kei Nishikori.

World number 25 Spaniard Feliciano Lopez is the biggest gainer from this controversial ranking system, as he has been made the 19th seed, while Bulgaria's Grigor Dimitrov will start as 11th seed.

In the women's category, four-time champion Serena Williams is the top seed , while Li Na is second followed by Simona Halep. Agnieszka Radwanska of Poland has been given fourth seeding, Maria Sharapova is fifth.

Ana Ivanovic is 11th, after winning her first grass-court title at the Aegon Classic final. Heather Watson and Jo Konta of Britain have obtained direct entry in the main draw due  to their rankings.