Andy Murray is now the British men's number 23 after his continuing injury problems meant he slumped to 839 in the latest world rankings.
The former world number one fell 690 places in Monday's list after his withdrawal from Wimbledon.
Murray, 31, has struggled to recover from hip surgery in January and has only played three matches since reaching the quarter-finals at the All England Club in 2017.
His current position means he is ranked alongside several part-time players and members of the second-tier Challenger Tour.
Murray is hoping to return at the Citi Open in Washington at the end of July as he tries to play himself into form for the US Open.
Fortunes are different for current British men's number one Kyle Edmund, who is up to a career-high 16th.
Novak Djokovic's fourth Wimbledon crown saw him rise to 10th in the world.
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