Andy Murray was too strong for Jeremy Chardy in Shanghai
Andy Murray made sure of a place at the ATP World Tour Finals after reaching the last eight of the Shanghai Masters.
The world number four cruised to a 6-3 6-4 win over Frenchman Jeremy Chardy and will next face Jo-Wilfried Tsonga, who beat Florian Mayer 7-5 6-3.
Victory guaranteed Murray, 23, his place in next month's season-ending World Tour Finals at London's O2 Arena.
"It was a big match because I knew if I won I qualified for London," said Murray. "I was a little bit nervous."
The Scot, who seemed to have recovered from the illness which hampered him at last week's
, was never really threatened by a player he had beaten in their previous two meetings.
And he was helped by an erratic performance from the Frenchman, also 23, whose error-strewn display prevented him from capitalising on the chances which came his way.
Murray made a stuttering start to the match, losing the first three points on serve as Chardy, the world number 59, carved out three break points.
But he battled back to hold serve and then broke Chardy's serve in the next game to take an early advantage in the opening set.
"I served well under pressure," Murray said. "That was really, really important to get a good start in the match because he's very, very streaky.
"He can play some great tennis, so I needed to try to get ahead early and I managed to do that."
Chardy did have break points in the fifth and seventh games but failed to take them as Murray served out to take a one-set lead.
He then had two break points in the third game of the second set and although he was unable to take them, he was handed the initiative in game seven when Chardy, after saving two further break points, double-faulted for the first time in the match on the third, handing Murray a 4-3 lead.
He did not waste the opportunity and comfortably sealed victory in one hour and 21 minutes.
The match was watched by a sparse crowd in Shanghai but Murray insisted it was not a problem, saying: "It's not necessarily a lack of motivation, it's just a question of bringing some energy into the match.
"I feel like when I am sweating a lot I am in a match and it's incredibly humid in here so it wasn't actually a problem."