On April 8, 2023, Atencio scored his first MLS goal, a long-distance strike in a 3–0 home victory over St. Louis City SC.
[7] He suffered an injury to his right adductor and spent several months recovering during the 2023 season, where he saw inconsistent playing time.
[9] In a February 15, 2025 transaction one week prior to the start of a new campaign, Atencio was acquired by the Colorado Rapids from the Sounders for $1.3 million in General Allocation Money (GAM) split evenly across two seasons and an additional $300,000 in conditional GAM based on performance.
[12] Atencio made his debut for the senior United States national team on January 20, 2024, in a friendly against Slovenia.
[13] He was selected as an alternate for Team USA at the 2024 Paris Olympics,[14] and played after Gianluca Busio was injured.