Andy Murray is now the British men's number 23 after he dropped to 839 in the world rankings following his injury problems.
The former world number one fell 690 places in Monday's rankings after he pulled out of Wimbledon.
The 31-year-old had hip surgery in January after being out of action since last year's Wimbledon.
He has only played three matches since then, winning one at Eastbourne last month.
Murray is due to return to action at the Citi Open, which starts in Washington on 30 July.
He also hopes to play Masters level events in Toronto and Cincinnati before the US Open, which begins on 27 August.