Joao Fonseca defeats Learner Tien in Miami Open opener

Joao Fonseca made a remarkable debut at the 2025 Miami Open, defeating Learner Tien in a closely contested match that ended 6-7(1), 3-6, 6-4. The match featured dramatic swings in momentum and a brief medical timeout for Fonseca, who rallied to secure victory after a physical two-hour battle. This win marks Fonseca's third consecutive victory over Tien, having previously defeated him at the Next Gen ATP Finals. Next, Fonseca will face 19th seed Ugo Humbert, who recently claimed his seventh tour-level title. Meanwhile, Marcos Giron is set to compete against Jordan Thompson, both of whom have had mixed results at Miami, with Giron having the stronger serve. The matchup is anticipated to be competitive, given Thompson's experience and Giron's recent form.