Querrey's big serve will be his main weapon against Murray
Britain's Andy Murray will face Sam Querrey in the second round of the Paris Masters after the American was handed victory in his opening match.
Marcos Baghdatis, Querrey's first-round opponent, withdrew because of a back injury in the final set when trailing narrowly 7-5 6-7 (5-7) 3-2.
"I felt a sharp pain and I didn't want to take any risks," the Cypriot said.
The in-form Murray, who retained the St Petersburg title last weekend, received a bye through to the second round.
If Murray comes through his match against Querrey, he is set to face either Juan Martin del Potro or David Nalbandian in the quarter-finals and Wimbledon champion Rafael Nadal in the semis.
Meanwhile, Nicolas Kiefer beat Ivo Karlovic 6-4 7-5 in the first round and there were also wins for Croatia's Marin Cilic and Tomas Berdych of the Czech Republic.
Cilic defeated Italy's Andreas Seppi 7-6 (7-5) 6-2 and Berdych saw off Robby Ginepri 6-4 7-5.
Mario Ancic served 14 aces in defeating Rainer Schuettler of Germany 6-4 3-6 6-1, while Feliciano Lopez beat Janko Tipsarevic 6-3 6-4.
Former world number one Marat Safin went down 6-0 7-6 (7-4) to Juan Monaco.
There was disappointment for home fans when Frenchman Paul-Henri Mathieu lost 7-6 (8-6) 6-3 to Igor Andreev of Russia.
"This season ended very badly for me," said Mathieu. "I had a lot of hopes for the indoor season."