In the 2014–15 season Imboden made the quarter-finals in the San Francisco World Cup and proceeded to win gold at the Prince Takamodo World Cup in Tokyo after overcoming Russia's Dmitry Rigin in the final. He posted a third place in the Trofeo Inalpi in Turin, Italy. In January 2015 he achieved a double gold at the Challenge International de Paris: he became the first American to win the individual event after defeating Italy's Daniele Garozzo, then earned a second gold medal in the team event after Team USA prevailed over Italy. Imboden then took a bronze medal in the Havana Grand Prix. In April he won the Master de Fleuret in Melun, prevailing over Ma Jianfei in the final. Two weeks later he earned the gold medal at the 2015 Pan American Championships in Santiago, his third individual Pan American title. The 2015 World Championships in Moscow proved a disappointment: Imboden was defeated in the table of 16 by Olympic champion Lei Sheng. In the team event, the United States lost to Italy in the quarter-finals and finished sixth after the placement rounds. Imboden did, however, ended the season World no.1, ten points ahead of newly crowned world champion Yuki Ota, thus becoming the first American male fencer to win the overall World Cup.