Tennis: Djokovic seals spot at ATP year-ender

Serbia's Novak Djokovic celebrates his victory over Spain's Rafael Nadal at the end of their men's quarter final match of the Roland Garros 2015 French Tennis Open in Paris on June 3, 2015. -- PHOTO: AFP  
Serbia's Novak Djokovic celebrates his victory over Spain's Rafael Nadal at the end of their men's quarter final match of the Roland Garros 2015 French Tennis Open in Paris on June 3, 2015. -- PHOTO: AFP  

LONDON (REUTERS) - Tennis' world No. 1 Novak Djokovic will bid for a record fourth successive ATP World Tour Finals crown in London later this year after becoming the first man to qualify for the season-ender.

Five-time Australian Open champion Djokovic reached the French Open semi-finals by crushing Rafa Nadal on Wednesday and has been virtually unbeatable this season and is currently on a 27-match unbeaten run.

The 28-year-old Serb is looking to become the eighth man in history to complete a career grand slam by winning the French Open this week.

Djokovic won the elite ATP Tour Finals for the first time in Shanghai in 2008 and has a hat-trick of titles in London, last year gaining a walkover against injured Roger Federer.

"I had a great start to 2015 so I am really happy to have qualified so early. I hope I will have a great finish to the year too; I love playing at the O2," Djokovic said.

London's O2 Arena has hosted the event since 2009.