[8] Playing in the Boys' Singles at the 2023 French Open, Blanch defeated junior world No.1 Rodrigo Pacheco Méndez in straight sets, and compatriot Cooper Williams on his way to the semifinals.

[11] With Maxwell Exsted and Jagger Leach, he was part of the American team which finished third at the 2023 Junior Davis Cup.

[12] In February 2022, Blanch became the second youngest player to score an ATP ranking point when he defeated Gerald Planelles in three sets in Villena.

[13] In March 2024, he was awarded a wildcard into the men's singles at the 2024 Miami Open for his ATP Tour level debut.

The following month, he was given a wildcard to the 2024 Madrid Open and lost in the first round against Rafael Nadal, also in straight sets.