London: Marin Cilic's shock victory at the US Open has seen Britain's Andy Murray drop to 11th in the latest ranking list.
Cilic, who beat Kei Nishikori in straight sets in Monday's final in New York, climbs to ninth, equalling his career-high ranking.
Nishikori is up to number eight in the ATP list as a result of his run at Flushing Meadows, which included a semi-final victory over Novak Djokovic.
Despite the two shock finalists – the final was the first in almost 10 years not to feature one of the game's Big Four of Djokovic, Murray, Roger Federer and Rafael Nadal – the new ranking list has a familiar look to it.
Djokovic remains number one ahead of Nadal, who missed the US Open due to injury but is due to return to action before the end of the month.
Federer stays third with his Swiss compatriot Stan Wawrinka fourth.
Murray's new ranking of 11 means he faces a battle to secure one of the eight slots available for the end-of-season World Tour Finals in London in November.
He has a significant number of points to make up on Tomas Berdych, who occupies the final qualifying position.
The good news for Murray, who lost to Djokovic in the last eight last week, is that he has no ranking points to defend for the rest of the year as he missed the end of the 2013 season after undergoing back surgery.
That will give him hope of climbing back into the top eight in order to qualify for the season-ending ATP World Tour Finals in London.
The 27-year-old Scot lost to Novak Djokovic in the quarter-finals in New York. He is due to play three more events before the London tournament and he may need to reach the final of either the Shanghai or Paris Masters to have a decent chance of qualifying.
Murray has fallen from three to 11 in the rankings since having back surgery in September 2013, two months after winning Wimbledon.
Since his operation, he had not beaten a top-10 player until overcoming Jo-Wilfried Tsonga in the fourth round at Flushing Meadows. At this year's other three Grand Slam events, Murray reached the last eight at the Australian Open and Wimbledon, while he was beaten at the semi-final stage of the French Open.
Cilic overwhelmed Japanese star Nishikori 6-3, 6-3 6-3, carrying the momentum from his semi-final victory over Roger Federer and turning it into major silverware and a £3million cheque. The Croatian said: "It seems completely unreal to be called a Grand Slam champion.
"I have dreamed about this all my life and then suddenly, over the last four or five days, everything started to change.
"It means everything. It's a huge accomplishment and huge moment for myself and for my team and for everybody around me who was with me all these years supporting me, believing in me and never giving up. This is just the peak of the world."
It was the first slam final in almost 10 years not to feature Federer, Djokovic, Rafael Nadal or Murray and the first between two first-time finalists ranked outside the top 10 since Pat Rafter beat Greg Rusedski in the US Open final in 1997.