World number three Jannik Sinner faced a tough challenge from Dutchman Tallon Griekspoor but ultimately secured a hard-fought victory to advance to the fourth round of the Miami Open on Sunday.

As the second seed, Italian Sinner, a two-time finalist in Miami, initially struggled against Griekspoor's powerful play, losing the first set. However, Sinner managed to turn the tide after a rain delay during the second set, emerging victorious with a 5-7, 7-5, 6-1 win.

Reflecting on the match, Sinner acknowledged the mental toughness required to overcome the adversity, stating, "It has been a tough day for me, but very happy about the result."

Sinner's next opponent will be Australian Christopher O'Connell, who secured a tight win over Martin Damm of the USA with scores of 7-6 (7/5), 7-6 (7/5).

In another match, reigning champion Daniil Medvedev defeated Britain's Cameron Norrie with a score of 7-5, 6-1. Despite his victory, Medvedev noted the challenge posed by rapidly deteriorating balls, which affected the flow of the game.

Meanwhile, Hungarian Fabian Marozsan caused an upset by triumphing over world number seven Holger Rune with a commanding 6-1, 6-1 victory in just 59 minutes. Marozsan's exceptional performance sets up a third-round encounter with Alexei Popyrin of Australia.

On the American front, Ben Shelton kept the Star Spangled flag flying with a solid 6-3, 6-4 win over Spanish teenager Martin Landaluce. Shelton's dominant display, backed by strong serving and confident play, sets up a third-round clash against 23rd seed Italian Lorenzo Musetti.

As the Miami Open progresses, the competition intensifies, promising more thrilling matches and captivating moments for tennis fans worldwide. Stay tuned for further updates from one of the most prestigious tournaments in the tennis calendar.