Tim Henman and Todd Martin must wait until tomorrow before concluding their fourth round tie on centre court.
The umpire suspended play before 9pm due to poor light with Henman leading 6-7 7-6 6-4.
Pete Sampras' hopes of a fifth consecutive Wimbledon title were dashed today as Roger Federer produced the upset of the tournament.
In a thrilling five-set encounter, Federer overcame seven-time champion, Sampras 7-6 5-7 6-4 6-7 7-5.
Earlier, British number two Greg Rusedski slumped to a straight sets defeat to Croatian Goran Ivanisevic on court one.
With serves of upto 130mph, unseeded Ivanisevic sealed his place in the quarter finals with a 7-6 6-4 6-4 win over a beleagured Rusedski.
Second seed Andre Agassi will meet Nicolas Escude the next round after beating Germany's Nicolas Kiefer in three sets, 6-3 7-5 7-5.
Escude sealed his place in the quarter-finals after his five-set victory over fifth seed Lleyton Hewitt.
Frenchman Escude, seeded 24th, lost the first set, 4-6 but came back to claim the second and third 6-4 6-3.
Hewitt made it two sets each in the fourth (4-6) before Escude sealed a memorable win to claim the fifth, 6-4.
Venus Williams made light work of her fourth round clash with Russian Nadia Petrova, winning in straight sets 6-2 6-0, for a last eight place against Nathalie Tauziat.
Lindsey Davenport stepped up her bid for a second Wimbledon title after beating Jelena Dokic on centre court.
The 1999 champion and last year's runner-up swept 14th seed Dokic aside, 7-5 6-4 to set up a quarter final clash with seventh seed Kim Clijsters of Belgium, who scraped through 7-6 7-6 against American Meghann Shaughnessy.
Serena Williams booked her place in the last eight with a 6-2 6-1 win over 12th seed Magdalena Maleeva, in a game which lasted just 49 minutes.
The American fifth seed blew away the Bulgarian 12th seed 6-2 6-1 in just 49 minutes in their fourth-round match.
Guillermo Canas was brought down to earth with a bang as Swede Thomas Enqvist crushed the unseeded Argentinean 6-3 6-3 6-1.
After disposing of Yevgeny Kafelnikov in the previous round, much had been expected of Canas but Enqvist proved too strong, storming to a straight sets win and a last eight clash with Pat Rafter, who beat Mikhail Youznhy 2-6 6-3 6-2 7-5.
Read more about Wimbledon here.
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