PARIS – World number one and defending champion Novak Djokovic reached a 16th French Open quarter-final on Sunday where old rival and 13-time winner Rafael Nadal could be waiting. Djokovic, bidding to equal Nadal’s record of 21 Grand Slam titles, eased to a 6-1, 6-3, 6-3 last-16 victory against 15th seed Diego Schwartzman of Argentina. “I have a lot of respect for him (Schwartzman). He’s a good person off the court,” said Djokovic who has now beaten Schwartzman seven times in seven meetings. Djokovic is still to drop a set at Roland Garros after cruising through the first week. He has also won…