Here is a comprehensive summary of the Wikipedia article on Colton Smith:

Colton Smith (born March 5, 2003) is an American professional tennis player who reached a career-high ATP singles ranking of world No. 133 on August 25, 2025, after playing college tennis at the University of Arizona. He made his first Challenger final in 2024, losing to Borna Gojo, but truly broke out in 2025 by winning his maiden title at the Cleveland Open and then qualifying for the Indian Wells Open, where he made his ATP Tour and Masters 1000 debut and recorded his first tour-level win over Flavio Cobolli. At the U.S. Men's Clay Court Championships, he reached his first ATP Tour quarterfinal—defeating 2023 NCAA champion Ethan Quinn—before falling to top seed Tommy Paul. Later that July, he qualified for his second Masters 1000 event at the National Bank Open in Toronto but lost to Learner Tien in the first round. Overall, his combined ATP Challenger and ITF World Tennis Tour singles record stands at an impressive 4 titles and 4 runner-up finishes across 8 finals.