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After a relatively dry morning the rain returns to Wimbledon just as the players are preparing to start their matches

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Play finally gets underway after a two-and-a-half-hour delay with Roger Federer taking on Sjeng Schalken

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Schalken has been struggling to recover from a foot injury and can't compete with the Swiss in the first set, losing it 6-3

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Federer has the better all-round grass court game and he earns the crucial break in the second set to go clear

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Schalken shows some spirit to earn a break in the third set and really puts Federer under pressure for the first time

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Federer, however, shows his class again to recover the break and win the set for a straight-sets victory

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In the last quarter-final to get started Jonas Bjorkman gives away an early break and loses the first set to Andy Roddick

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Roddick once more lives up to his billing as tournament favourite, blasting his way to the second set 6-2

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The fifth seed's supreme form continues as he has an answer to even the canniest of Bjorkman's shots

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Roddick's thundering serve is in evidence again as he closes out the match in straight sets to ease into the semi-finals

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The American will face Federer in an intriguing semi-final on Friday with the winner likely to start the final as favourite