Madrid Masters: Djokovic moves into quarterfinals

Defeats Feliciano Lopez 6-4, 7-5.

Novak Djokovic celebrates his victory over Feliciano Lopez.

World No. 2 Novak Djokovic reached the quarterfinals of the Madrid Open on Thursday with a straight set victory (6-4, 7-5) over Feliciano Lopez.

Djokovic, who won the tournament last year, had fewer problems against the 35-year-old Spaniard than in his three-set second round test with Nicolas Almagro a day earlier, taking the first set 6-4 before breaking in the 12th game of the second to avoid a tie-break.

Rain in the Spanish capital meant the roof on the Manolo Santana court was closed for the game, slowing down Lopez's powerful serve to the advantage of the Serb, who recently split from his long-term coach Marian Vajda.

Djokovic joins David Goffin in the quarterfinals after the Belgian beat Milos Raonic 6-4 6-2, along with Kei Nishikori, who saw off David Ferrer of Spain 6-4 6-3. German Alexander Zverev also reached the last eight by beating Czech Tomas Berdych.

Crowd-favourite Rafael Nadal, the only remaining Spaniard in the tournament, plays Australian Nick Kyrgios.