Spain's David Ferrer continued his strong play at the BNP Paribas Masters, brushing aside talented Ukrainian Alexandr Dolgopolov 6-3, 6-2 here Thursday to advance to the quarterfinals.

The solid baseline play and relentless defense of the world No. 5 were too much for the error-prone Ukrainian, whose low first-serve percentage proved costly against one of the best returners in tennis.

For the match, Dolgopolov put just 43 percent of his first serves in and won just 46 percent of his overall service points.

The Spaniard broke serve five times, twice in the first set and three times in the second.

Next up for Ferrer will be big-serving American John Isner, a 6-4, 6-2 winner over Spain's Feliciano Lopez in Thursday's final match.

The winner of that match will take on either world No. 1 Novak Djokovic of Serbia or France's Jo-Wilfried Tsonga in Saturday's semifinals.

The only remaining Latin American player in the tournament, Argentina's Juan Monaco, saved two match points in the second-set tiebreaker and then advanced to the quarterfinals with a 1-6, 7-6 (8-6), 1-2, ret. victory when American Mardy Fish was forced to retire with a hamstring injury.

Monaco, who is riding a hot streak after reaching the final of a tournament in Valencia, Spain, last week, will next face 16-time Grand Slam champion Roger Federer of Switzerland on Friday.

The Monaco-Federer winner will square off on Saturday against either Scotland's Andy Murray or Czech Tomas Berdych.

The BNP Paribas Masters is the last of this season's nine ATP World Tour Masters 1000 events, which trail only the four Grand Slams and the year-end championship in terms of ranking points.