He will now play Kei Nishikori of Japan, who overcame Germany’s Philipp Petzschner 6-3, 4-6, 7-5.
The second seeded Serbian Victor Troicki also secured himself a place in the quarters as he eliminated Denis Istomin of Uzbekistan 6-1, 6-4. He will be playing Austrian Jurgen Melzer next.
In the other matches, third-seed Janko Tipsarevic ousted Flavio Cipolla 6-2, 6-4 and will face Nikolay Davydenko of Russia, who beat Poland’s Lukasz Kubot 6-3, 7-6 (2).
