Carlos Alcaraz, the defending champion, advances to the fourth round in Miami.

Carlos Alcaraz, the defending champion, is through to the fourth round of the Miami Open after defeating Dusan Lajovic in straight sets. Alcaraz, aged 19, who won the Indian Wells title last week, returned to the world number one ranking. Alcaraz won easily, taking just over 90 minutes to beat his Serbian opponent with a score of 6-0 7-6 (5). He broke his opponent in the opening game and took the set in just 32 minutes. Alcaraz suffered his first break of serve at 5-4 in the second set before securing his victory in a tiebreak. His next opponent will be Tommy Paul, who beat Alejandro Davidovich Fokina with a score of 6-3 7-5. Alcaraz is pleased with his performance and the variety of shots he is playing and will want to retain his title to prevent Novak Djokovic taking his world number one ranking.