Joao Fonseca is a Grand Slam junior champion…

The 17-year-old Brazilian tennis player, the tournament’s No. 7 seed, won the boys division title at the US Open by beating Learner Tien 4-6, 6-4, 6-3.

Tien, a 17-year-old American who was seeded No. 11, lost to 2022 US Open semifinalist Frances Tiafoe in straight sets in the first round of the men’s tournament.

Fonseca previously reached the boys doubles final at the 2023 Australian Open with partner Alexander Blockx, losing to Tien and Cooper Williams 4-6, 4-6.

Fonseca, the ninth South American to reach the boys final, is the sixth to lift the champion trophy.