Injury-stricken Rafael Nadal and Wimbledon finalist Andy Roddick will be among the big names forced to miss the Davis Cup World Group quarter-finals starting on Friday.
Nadal is unable to turn out for champions Spain against Germany in Marbella due to his ailing knees. Spain are also without David Ferrer, who has a muscle strain and has been replaced by Juan Carlos Ferrero, while a hip injury has forced Roddick out of the US squad facing Croatia.
The timing of the last-eight clashes immediately after the gruelling clay and grass court seasons again highlights the difficulties the players face with a packed calendar.