Tallon Griekspoor stunned top seed Alexander Zverev 4-6, 7-6 (5), 7-6 (4) in a 3-hour, 7-minute second-round clash Friday at the BNP Paribas Open. And No. 4 seed Casper Ruud fell to American Marcos Giron in the other big upset of the day.

The win was just Griekspoor's second in eight matches against Zverev, and the first time Griekspoor has beaten a player ranked in the top 5. For Zverev, he becomes the first No. 1 seed to lose his opening match at the BNP Paribas Open since Andy Murray fell to 2017 to Vasek Pospisil 6-4, 7-6 (5).

The top seed Alexander Zverev embraced a short Indian Wells campaign. World no. 2 faced Tallon Griekspoor in the second round and experienced a tough 4-6, 7-6, 7-6 defeat to Tallon Griekspoor in three hours and seven minutes.

World No. 43 Tallon Griekspoor upsets World No. 2 Alexander Zverev at the BNP Paribas Open in a three-set thriller.

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Alexander Zverev’s hopes of becoming the men’s world No. 1 suffered a blow on Friday as he crashed out of the BNP Paribas Open at Indian Wells in the second round following a shock defeat to Tallon Griekspoor.

Alexander Zverev's alarming slump in form continued as he was beaten by Tallon Griekspoor in his opening match at the Indian Wells Masters.