Argentine Juan Martin del Potro moved up one spot to No. 8 in the ATP 2008 Race after booking his place in the Austrian Open second round on Wednesday.
The third seed beat wild card Martin Fischer of Austria 7-6 ,6-4 in two hours and 12 minutes.
With a 30-2 match record since July, Del Potro will next meet German Philipp Kohlschreiber in the second round as he bids to qualify for Tennis Masters Cup Shanghai.
Del Potro, who moved past James Blake in the ATP 2008 Race, is looking to claim one of four remaining singles berths to Tennis Masters Cup Shanghai and to finish inside the year-end Top 10 for the first time in his career.
In second round action, Fernando Gonzalez of Chile reached his third ATP quarterfinal in as many weeks after saving five match points to beat Ernests Gulbis of Latvia 4-6, 7-6, 6-1 in two hours and 11 minutes.
After edging past the second set tie-break, second seed Gonzalez won the deciding set in just 23 minutes with Gulbis winning only 10 points.
Elsewhere, Frenchman Gael Monfils made a stuttering start with a 3-6, 6-1, 6-3 win over Austrian Alexander Peya in the first round. Monfils next meets tough Czech Radek Stepanek.
Fifth-seeded Spaniard Fernando Verdasco knocked out Guillermo Canas of Argentina 6-1, 6-2 in 69 minutes in another second round match.