2018 (D.C. United): The second-year USMNT player was a constant figure in United’s midfield with 28 appearances (25 starts). In the Audi Field opener on July 14, Arriola bagged his first brace of the season, scoring in the 61st and 78th minutes. He continued his outstanding season with another brace against Montreal on Sept. 28. The attacking midfielder earned MLS Goal of the Week for Week 16 with an acrobatic diving header against Toronto FC. Arriola was also featured on six MLS Team of the Week sheets, setting career-highs in goals scored (7) and total assists (8). His performances for D.C. United earned him two caps in 2018 for the USMNT in international friendlies against Bosnia-Herzegovina and Brazil. Arriola logged 45 minutes off the bench against Bosnia-Herzegovina on Jan. 28 and 55 minutes as a starter against Brazil on Sep. 7.
2016-2017 (Club Tijuana): In 31 appearances with Xolos, Arriola featured in 31 matches, scoring twice and adding in one assist. In that year's Liga MX Clausura season, Arriola started all but one match as the Xolos qualified for the Liguilla Clausura.
2015-2016 (Club Tijuana): Arriola scored five games into the 2015 Liga MX Apertura season when he struck against Cruz Azul on Aug. 15, 2015. He went on to rack up 250 minutes of playing time in the Liga MX Clausura season. Xolos reached the quarterfinals in both the Copa MX Apertura and the Copa MX Clausura.
2014-2015 (Club Tijuana): The young American made 13 appearances in all competitions for Xolos during the 2014-2015 season, racking up a total of 533 minutes of playing time.
2013-2014 (Club Tijuana): Arriola made his professional debut on July 7, 2013, recording an assist in a 3-3 draw against Atlas. The Liga MX rookie ended the year with three goals and two assists across all competitions, including two goals during Xolo's run to the semifinals in the CONCACAF Champions League.
Arriola has represented the United States at every level, culminating in his senior team debut on May 22, 2016, against Puerto Rico, where he scored and had an assist. The Chula Vista, Calif. native became only the ninth player in U.S. history to score a goal in his first two international matches when he scored the Yanks’ final goal in their 4-0 victory over Trinidad and Tobago in September’s World Cup Qualifier (which also happened to be his WCQ debut). Arriola most recently played an integral part of Bruce Arena’s CONCACAF Gold Cup-winning squad, starting four matches (including the final). Arriola has amassed 11 caps with the national team in just over a year.
Signed as a Young Designated Player on Aug. 9, 2017 after arriving from Club Tijuana (Liga MX) on a permanent transfer.