Tallon Griekspoor stunned top-seeded Alexander Zverev 4-6, 7-6 (7/5), 7-6 (7/4) in the second round at Indian Wells on Friday, avenging a devastating loss to the German at Roland Garros last year.American Marcos Giron joined Griekspoor in posting his first win over a top-five player, upsetting fourth seed Casper Ruud 7-6 (7/4), 3-6, 6-2.