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World number one Rafael Nadal eased past Spanish compatriot Guillermo Garcia Lopez to reach the Barcelona Open quarter-finals.

The defending champion came through 6-1 6-3 to extend his Open era record to 40 consecutive sets won on clay.

The 31-year-old, who has won the title 10 times, will face Slovakian qualifier Martin Klizan in the last eight.

Klizan followed up his second-round win over Novak Djokovic by beating Spain's Feliciano Lopez 6-1 6-4.

Elsewhere, second seed Grigor Dimitrov of Bulgaria saved two match points to beat Tunisia's Malek Jaziri 7-5 3-6 7-6 (10-8).

Dimitrov will now meet Spain's Pablo Carreno Busta, who beat France's Adrian Mannarino 6-2 4-6 7-6 (8-6).

Dominic Thiem will play Greece's Stefanos Tsitsipas in the quarters, after the Swiss third seed beat Slovakian Jozef Kovalik 7-6 (7-5) 6-2.

Tsitsipas, 19, knocked out Spaniard Albert Ramos-Vinolas 6-4 7-5.

World number 10 David Goffin, from Belgium, came through 2-6 7-6 (7-2) 6-0 against Russia's Karen Khachanov to earn a last-eight draw against Roberto Bautista-Agut, who beat fellow Spaniard Pablo Andujar-Alba 6-4 6-1.