Tony Alfaro

Alfaro spent his entire college career at California State University, Dominguez Hills. He made a total of 75 appearances for the Toros and tallied 10 goals and six assists. He also played in the Premier Development League for Ventura County Fusion.

Seattle Sounders

On 14 January 2016, Alfaro was selected in the second round (27th overall) of the 2016 MLS SuperDraft by Seattle Sounders FC. He signed a professional contract with the club two months later. On 25 March 2016, Alfaro made his professional debut for USL affiliate club Seattle Sounders FC 2 in a match against Sacramento Republic and conceded a penalty in the 62nd minute. Sacramento would convert their PK and win 1–0. On 28 May 2016, Alfaro made his first-team debut for Seattle Sounders FC as a substitute for injured captain Brad Evans in the team's 1–2 loss against the New England Revolution. On 4 March 2018, Alfaro received a red card in the 83rd minute, as the Sounders lost its opening game of the 2018 season 1–0 to recent expansion team Los Angeles.

Guadalajara

In December 2018, Alfaro passed a trial with C.D. Guadalajara and was signed as a free agent. He spent time on loan with Zacatepec in 2019.

Reno 1868

On 31 January 2020, Alfaro signed with USL Championship side Reno 1868 FC. Reno folded their team on November 6, 2020, due to the financial impact of the COVID-19 pandemic.

D.C. United

On 16 April 2021, Alfaro returned to Major League Soccer, signing with D.C. United. The next day, Alfaro debuted for the team in the 2–1 win over New York City. Alfaro scored his first MLS career goal on 1 May 2021, in a 1–4 loss against the San Jose Earthquakes. Following the 2022 season, his contract option was declined by D.C.…

Seattle Sounders FC

MLS Cup: 2016