Djokovic continues calm French Open progress as Nishikori battles past Paire

• Djokovic easily beat Jan-Lennard Struff 6-3, 6-2, 6-2• Nishikori goes into quarter-finals with five-set win over Paire Top seed Novak Djokovic's untroubled progress continued at the French Open as he chalked up a fourth successive straight-sets victory on Monday, this time outclassing Jan-Lennard Struff to reach the quarter-finals. His 6-3, 6-2, 6-2 defeat of the 45th-ranked German means Djokovic is the first man to reach 10 successive quarter-finals at Roland Garros - a feat even Rafael N...