Berdych, the eighth-seeded Czech, cruised past America's Robby Ginepri 6-3, 6-3 in just 65 minutes while Davydenko, the Russian fourth seed, took just six minutes longer to reach the last eight with a 6-2, 6-2 win over compatriot Dimitry Tursunov.

Their no-nonsense, express trip to the next stage was in stark contrast to Wednesday's action at the Bercy arena when the day's programme did not end until 0100 on Thursday morning.

Davydenko's impressive win should also have guaranteed him a place in the Davis Cup final.

He had been edged out of the singles line-up by the America-based Tursunov in the semifinal victory over the United States.

But his run to a second consecutive last eight place here should see him line up alongside Marat Safin for this year's final against Argentina in Moscow in December.

Davydenko will now face either Croatian ninth seed Mario Ancic or unseeded Frenchman Julien Benneteau for a place in the semifinals.

"It's not difficult to play against a Davis Cup colleague because this is singles and that is the consideration," said the 25-year-old Russian who is chasing his fifth title of 2006.

In two matches so far here, he has dropped just four games and has spent less than two hours on court.

Later Thursday the fight to grab the three remaining places at the season-ending Masters Cup in Shanghai continues.

Spanish sixth seed Tommy Robredo faces France's Paul-Henri Mathieu while James Blake, the American seventh seed, takes on German 10th seed Tommy Haas.

Roger Federer, Rafael Nadal, Ivan Ljubicic, Andy Roddick, who are not playing this week, and Davydenko have already made sure of their places in the China event which starts on November 12.

Argentina's David Nalbandian, currently sitting sixth in the race to grab one of the places in the eight-man field, is sitting out Paris with a stomach injury.