(CNN) -- Andy Roddick beat Gilles Simon in straight sets to clinch his place in the season-ending Shanghai Masters -- while Andy Murray and Roger Federer joined him in the quarterfinals of the Paris Masters.
Roddick has secured a place in the season-ending Shanghai Masters for a sixth straight year.
The American saw off Simon 6-3 7-5, while Murray defeated Spanish 15th seed Fernando Verdasco 6-3 7-6 and Federer cruised past Marin Cilic of Croatia 6-3 6-4 to all reach the last eight.
Also into the quarterfinals is top seed Rafael Nadal, who proved too strong for home hope Gael Monfils, going through 6-3 6-2.
Nadal was never in serious trouble as he staved off a triple break point to land the first set and then did likewise in the fourth game of the second set to put Monfils, whom he had already beaten twice this year for the loss of just five games, firmly in his place.
Roddick's qualification for China means two of the eight spots remain open with another American, James Blake, and Frenchman Jo-Wilfried Tsonga waiting in the wings after they also moved through, Tsonga shocking his Australian Open final conqueror Novak Djokovic.
Simon stood eighth in the ATP Race going into Thursday's match but realistically needed to win as Blake and Tsonga are breathing down his neck. However, for Roddick, the wait is over.
"It's always an honor to qualify -- I'm looking forward to it," said Roddick, having reached the end-of-season showdown for a sixth straight year.
Roddick's win meant he cemented sixth spot and he next faces Tsonga, who ousted Serbian Djokovic 6-4 1-6 6-3.
Murray meanwhile had to scrap to earn a meeting with Argentine David Nalbandian as Verdasco took him to a second-set tie-break before the Scot emerged victorious 6-3 7-6.
Verdasco led 4-1 in the breaker but then double faulted to let Murray, bidding to become the first man to lift three straight Masters titles, back in.
The 21-year-old Murray took Nalbandian to five sets when they met at Wimbledon three years ago and the Argentine eighth seed and defending champion, a 6-4 6-0 winner over eighth-seeded Davis Cup team-mate Juan Martin Del Potro, said: "Andy is doing great and has won a lot of important titles."
Del Potro's loss means he is no longer in control of his Shanghai destiny. The rising star is seventh in the ATP Race but could slide out of contention.
Nalbandian and Del Potro will team up after China as Argentina target a first Davis Cup final at the expense of Rafael Nadal's Spain on November 21-23 in Mar del Plata.
Tsonga cheered the home fans in dumping out third seed Djokovic, pulling out a series of tremendous returns on both flanks after the Serb had pegged him back to one-set all.
But his Shanghai cause was not helped by 11th seed Blake gaining a 6-4 6-4 win over Germany's Philipp Kohlschreiber. Blake, now up against Federer in the quarterfinals, is 20 ranking points better off than Tsonga and if the latter loses to Roddick his Shanghai hopes will be extinguished.