the regular season as Chivas finished 8th in the Western Conference, missing out on the playoffs. Nagamura missed the first 4 games of the 2011 season after he injured his calf in preseason. He made his season debut on April 16, coming off the bench in a 0–0 draw with the Vancouver Whitecaps. He aggravated his calf injury during the game and missed the following 6 matches. On August 24 Nagamura was subbed off after breaking his foot in a 1–0 loss to the Portland Timbers. He missed the final 8 games of the season. He ended the season with just 11 appearances, 6 of them starts, and 1 assist as Chivas finished 8th in the West and missed the playoffs again. Sporting Kansas City On November 29, 2011, Nagamura was traded to Sporting Kansas City for a 2012 MLS Supplemental Draft pick. He missed the first game of the 2012 season due to a calf injury. On March 17, 2012, Nagamura made his SKC debut, coming off the bench in a 3–0 win against the New England Revolution. He scored his first goal for Kansas City on May 29 in a 3–2 win against Orlando City in the U.S. Open Cup 3rd round. In June, Nagamura had a groin injury that caused him to miss 4 MLS and 2 Open Cup games. On August 8, Nagamura played 120 minutes as Sporting beat the Philadelphia Union 3–2 on penalties in the Open Cup Final, with Nagamura converting the winning PK. He ended the regular season with 27 appearances, 1 goal, and 1 assist, helping SKC finish 1st in the Eastern Conference. He missed both of Kansas City's playoff games after hurting his ankle in the regular season finale. SKC lost 2–1 on aggregate to the Houston Dynamo in his absence. After starting 15 of Kansas City's first 16 MLS games of the 2013 season, Nagamura played just twice over the final 18 games due to an ankle injury. He ended the regular season with 17 appearances and 1 assist as Sporting finished 2nd in the East. Nagamura missed the first leg of the Conference Semifinals because of his ankle injury, but returned for the second leg, playing 97 minutes to help SKC defeat New England 3–1 in extra time, advancing 4–2 on aggregate. He played the full match in both legs of the Conference Finals as Sporting beat Houston 2–1