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.

Alexander Zverev's season is taking a very negative direction after his defeat to Jannik Sinner in the Australian Open final. The world number 2 – who dreamed of winning his first Major title at Melbourne Park – is still suffering from that clear defeat on the iconic Rod Laver Arena and has not yet recovered.

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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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).

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.