In July 2018, he won the Perugia Challenger tournament in Italy, defeating Italian Gianluigi Quinzi in the final 7–5, 6–2.

A year and a half later, he won the 2020 Ann Arbor Challenger in Michigan, USA defeating Roberto Cid Subervi of the Dominican Republic 3–6, 6–4, 6–2 to capture the championship.

He was defeated in the first round in a five-set thrilling match despite taking a two sets to love lead, by Chilean player Cristian Garín 6–4, 7–5, 4–6, 4–6, 2–6.

Blanch was born in San Juan, Puerto Rico, but his family moved to Seattle when he was just 3 days old.

Due to his father's job, Blanch has lived in multiple countries such as China, India, Thailand and Argentina.