Vienna - David Ferrer has advanced to his 15th quarter-final of the season after defeating Tobias Kamke of Germany 7-5, 6-1 at the Erste Bank Open on Thursday.
The fifth-ranked Ferrer, the top seed, avoided service breaks and converted his second match point with a forehand winner.
Ferrer, who needs to reach Sunday's final to improve his chances of qualifying for the ATP Finals, plays No. 6 Ivo Karlovic of Croatia in the quarter-finals.
Earlier, Thomaz Bellucci of Brazil rallied to beat No. 3 Feliciano Lopez 6-7 (9), 6-1, 6-4.
Lopez, who was ranked a career-high 14th after beating Rafael Nadal on his way to the Shanghai semi-finals last week, lost eight straight games from 1-1 in the second.
The Spaniard also lost 19 points in a row, including the first 13 of the final set.
Bellucci next plays Viktor Troicki of Serbia, who reached his third quarter-final since returning from a doping ban in July by beating No. 5 Lukas Rosol of the Czech Republic 6-3, 6-2.
Also, Jan-Lennard Struff won the last seven points in the third-set tiebreaker to beat Sergiy Stakhovsky of Ukraine 7-6 (6), 2-6, 7-6 (3).
The German will next play either Andy Murray or Vasek Pospisil of Canada.
Benjamin Becker of Germany defeated last year's finalist, Robin Haase of the Netherlands, 6-3, 6-3, winning six straight games to lead by a set and 2-0.
He lined up a quarter-final against fellow German Philipp Kohlschreiber.
Results on the fourth day of the ATP Austrian Open on Thursday (x denotes seeded player):
Andy Murray (GBR x2) bt Vasek Pospisil (CAN) 6-4, 6-4
David Ferrer (ESP) bt Tobias Kamke (GER) 7-5, 6-1
Thomaz Bellucci (BRA) bt Feliciano Lopez (ESP x3) 6-7 (9/11), 6-1, 6-4
Viktor Troicki (SRB) bt Lukas Rosol (CZE x5) 6-3, 6-2
Benjamin Becker (GER) bt Robin Haase (BED) 6-3, 6-3
Jan-Lennert Struff (GER) bt Sergiy Stakhovsky (UKR) 7-6 (8/6), 2-6, 7-6 (7/1)