Paris - American qualifier Sam Querrey has reached the second round of the Paris Masters by beating 2012 runner-up Jerzy Janowicz 6-7 (5), 6-2, 6-4 on Monday.
Querrey had 17 aces to 12 for Janowicz, a 2013 Wimbledon semi-finalist from Poland, and 46 winners to 32.
Philipp Kohlschreiber of Germany, Fernando Verdasco of Spain and Dominic Thiem of Austria also advanced.
Kohlschreiber cruised past French wild card Edouard Roger-Vasselin 6-3, 6-1 and will next play defending champion Novak Djokovic.
Verdasco overcame American qualifier Donald Young 4-6, 6-1, 6-3, while Thiem, the youngest player in the top 50, beat Alexandr Dolgopolov of Ukraine 6-2, 4-6, 6-0.
Janowicz won four straight points to lead 6-3 in the tiebreaker and capitalized on a double-fault from Querrey to take the first set.
But Querrey broke Janowicz twice in the second set and served an ace to even the match. The American broke for a 2-1 lead in the final set and converted his second match point with a forehand winner.
Santiago Giraldo of Colombia, American qualifier Jack Sock, Austrian veteran Jurgen Melzer and Adrian Mannarino of France also won their first-round matches.
Giraldo defeated Mikhail Youzhny of Russia 6-2, 6-4, Sock routed Pablo Andujar of Spain 6-1, 6-1, Melzer dismissed Guillermo Garcia-Lopez of Spain 6-4, 6-1, and Mannarino beat Pierre-Hugues Herbert of France 7-6 (3), 6-3.
Results on the first day of the ATP Paris Masters on Monday:
Philipp Kohlschreiber (GER) bt Edouard Roger-Vasselin (FRA) 6-3, 6-1
Fernando Verdasco (ESP) bt Donald Young (USA) 4-6, 6-1, 6-3
Adrian Mannarino (FRA) bt Pierre-Hugues Herbert (FRA) 7-6 (7/3), 6-3
Sam Querrey (USA) bt Jerzy Janowicz (POL) 6-7 (5/7), 6-2, 6-4
Santiago Giraldo (COL) bt Mikhail Youzhny (RUS) 6-2, 6-4
Dominic Thiem (AUT) bt Oleksandr Dolgopolov Jr. (UKR) 6-2, 4-6, 6-0