2019: In his final season with the Colorado Rapids, Serna made 14 appearances, starting six games. He tallied one assist, coming in Colorado’s wild season-opening 3-3 draw with the Portland Timbers (March 2).
2018: Serna played in 20 MLS regular-season games for the Colorado Rapids, starting 10, and scored once on the road versus Real Salt Lake (July 21). His 20 appearances, 10 starts and 1,181 minutes were all the second highest in his career, trailing behind his breakout 2014 season.
2017: Serna started nine of 19 appearances for the Colorado Rapids, tallying one goal and one assist. His goal production came in the space of three games, as he first scored at home against the LA Galaxy (June 21) before tallying an assist versus the Houston Dynamo (July 1).
2016: A knee injury curtailed Serna’s 2016 season with the Colorado Rapids as he made just nine appearances at the start of the year, scoring once – a game winner against Sporting Kansas City (May 11).
2015: Serna’s involvement in the Colorado Rapids’ 2015 campaign was limited due to international appearances with the U.S. Under-23 National Team, yet he still managed five goals and one assist in only 16 appearances (nine starts) in all competitions. He scored goals in two straight meetings with FC Dallas (April 10 and June 19) before tallying again against the Chicago Fire (Aug. 22). His sole assist came the following week against the Houston Dynamo (Aug. 26). Serna scored the first brace of his career in a U.S. Open Cup Fourth Round clash against the Colorado Springs Switchbacks (June 16).
2014: Serna enjoyed a breakout season with the Colorado Rapids, starting 18 of 27 appearances and tallying a career-high three goals and four assists. After recording his first assist against Toronto FC (April 12), he scored his first professional goal against the Seattle Sounders (April 26). Serna added another assist in a road game against Real Salt Lake (May 17) and found the net for the second time at the Philadelphia Union (July 12). His third assist of the campaign came against Chivas USA (July 25) before scoring again at D.C. United (Aug. 17) and notching his final assist against the San Jose Earthquakes (Sept. 27).
2013: Serna signed a Homegrown contract with the Colorado Rapids heading into the season and made his professional debut against Vancouver Whitecaps FC (Oct. 27) in the regular-season finale.
International: Serna has represented the U.S. at U-17, U-20 and U-23 levels – including playing at the 2011 Concacaf U-17 Championship and the 2011 FIFA U-17 World Cup in Mexico. He then represented the U-20s extensively but was not named to the squad for the 2013 FIFA U-20 World Cup. Serna went on to play for the U.S. U-23s in Olympic Qualifying in 2015 and 2016, while he also earned his first senior national team call-up for the annual January Camp in 2015 but did not make earn his first cap.
College: Serna spent one season at the University of Akron prior to signing as a Homegrown with the Rapids, tallying two goals and eight assists as a freshman – earning Mid-American Conference Men's Soccer Freshman of the Year honors in 2012.
Youth: Serna joined the Colorado Rapids Academy in 2009 and was quickly noticed by the U.S. National Team program who invited him to join the U.S. U-17 residency program in Bradenton, Florida. Serna returned to Colorado for the 2011-12 U.S. Soccer Development Academy season, leading the U-18 team with 12 goals.