Spain's Alejandro Davidovich Fokina defeated Federico Delbonis of Argentina in four sets to reach a maiden Grand Slam quarter-final at the French Open on Sunday. A day after his 22nd birthday, the world number 46 triumphed 6-4, 6-4, 4-6, 6-4. He will face either German sixth seed Alexander Zverev or Japan's Kei Nishikori for a place in the semi-finals. dj/mw