on aggregate. In MLS Cup 2013, Nagamura played 120 minutes and converted his penalty kick to help SKC defeat Real Salt Lake 7–6 on penalties, giving the club its first league title since 2000. He also played once in the Open Cup and made one appearance in the CONCACAF Champions League group stage, helping Kansas City top their group. Having missed the first 2 MLS games of the 2014 season due to an injury, Nagamura made his first appearance of the season on March 12 in leg 1 of the CCL quarterfinals, a 1–0 win vs Cruz Azul. Seven days later, Nagamura and SKC lost the second leg 5–1. On July 6, he hurt his ankle in a 1–1 draw with the Chicago Fire that kept him out for 2 months. Nagamura ended the regular season with 21 appearances, 2 goals, and 3 assists, helping Kansas City finish 5th in the Eastern Conference. He played the full 90 minutes in SKC's one playoff game, a 2–1 loss to the New York Red Bulls. He also played twice in the 2014–15 CCL group stage, with SKC failing to advance from their group. 2015 saw Nagamura deal with a back injury that limited his involvement in the first half of the season, keeping him out for all of June. On August 15, Nagamura scored in the 87th and 94th minute to give SKC a 4–3 win over the Vancouver Whitecaps, a performance that saw him named MLS Player of the Week. Kansas City finished the regular season in the 6th and final playoff spot in the Western Conference, with Nagamura contributing 3 goals and 1 assist in 21 regular season appearances. In their first playoff game, Nagamura played the full 120 minutes as Sporting and the Portland Timbers played to a 2–2 draw before Portland advanced on penalties 7–6, with Nagamura converting his PK in the shootout. Kansas City had better luck in the 2015 U.S. Open Cup Final, beating the Philadelphia Union 8–7 on penalties, with Nagamura playing the full 120 minutes and converting his penalty kick to help SKC win their third ever Open Cup. After missing the first 12 games of the 2016 season due to a calf injury, Nagamura made his first appearance of the year on May 15, coming off the bench in a 1–0 win over Orlando City. He suffered a quad strain in June that