Wimbledon champion Novak Djokovic's return to the top of the world rankings was confirmed on Monday, with 2013 winner Andy Murray slipping to 10th following his quarter-final exit at SW19.
The 27-year-old Serbian secured his second title at the All England Club - his seventh grand slam triumph - with a 6-7 (7/9) 6-4 7-6 (7/4) 5-7 6-4 win over Roger Federer on Centre Court on Sunday.
It ensured he climbed back to the ATP summit - at the expense of Rafael Nadal - for the first time since the week of September 30, 2013, and also saw him become the first player to qualify for the Barclays ATP World Tour Finals at the O2 in November.
"It feels great not only to win Wimbledon again but also to return to number one in the ATP Rankings," Djokovic said on www.atpworldtour.com.
"I got to number one for the first time in my career after winning Wimbledon in 2011 so it is nice to do it again here.
"I can't wait to return to London to defend the ATP Finals title. I have had a good run there in the past two years. I really enjoy playing at the O2."
Murray, meanwhile, dropped to his lowest ranking for six years after his surprise straight-sets defeat by Grigor Dimitrov in the last eight at Wimbledon.
The Scot, who missed three months at the end of last year after undergoing back surgery, was fifth going into the third major of the year, but has not beaten a top-10 player since overcoming Djokovic in last year's final at SW19.