Rafael Nadal will be the new world number one from next Monday after Roger Federer recall from the Cincinnati Masters with back damage.
The Swiss 19-time Grand Vigorous victor was the main player who could have refused Spain’s Nadal taking the best spot in the rankings from Andy Murray.
Federer was damged in Sunday’s Rogers Cup last annihilation by Alexander Zverev.
Briton Murray hauled out of Cincinnati a week ago as he keeps on recouping from a hip issue.
Dominant French Open champion Nadal comes back to the highest point of the rankings interestingly since July 2014.
The 31-year-old left the Rogers Cup in the last 16 against trump card Denis Shapovalov.
Federer went the distance to the final before losing to 20-year-old German Zverev in Montreal – the Swiss’ first competition since winning Wimbledon for the eighth time in July.
“I am extremely sorry to learn out,” said the world number three. “Cincinnati has a portion of the best fans on the planet and I am sad I will miss them.
“Lamentably, I changed my back in Montreal and I have to rest this week.”
The Cincinnati Masters paves the way to the US Open, the last Grand Vigorous of the year, which starts on 28 August.
Federer, 36, joins kindred best 10 players Murray, Kei Nishikori and Marin Cilic in recall, while 2016 US Open victor Stan Wawrinka and 12-time Grand Vigorous champion Novak Djokovic will miss whatever remains of the season.