Griekspoor secured a 6-7 (3), 7-5, 3-2 win, bringing Sinner's title defence in the ATP Masters 1000 event to the most unfortunate end, as per Olympics.com.
Italian world number two superstar Jannik Sinner marched to the third round of the Shanghai Masters during his title defence, defeating Daniel Altmaier on Saturday.
Djokovic, who opens his Shanghai Masters campaign against Marin Cilic, is seeded to meet world number two Sinner in the semifinal. The world number two Italian enjoys dominance over the tennis legend by a 6-4 margin, having won their past five meetings. While Djokovic has better record again