Ko Sung-hyun
With the retirement of Lee Hyo-jung, Lee has now paired with Ha Jung-eun in the mixed doubles. They won the US Open Grand Prix Gold in July with a 21–19, 21–13 win over fifth-seeded Chen Hung-ling and Cheng Wen-hsing of Chinese Taipei, also won the men's doubles with Ko Sung-hyun beating Howard Bach and Tony Gunawan of United States in the final. The next week, he participated in the Canada Open at the Richmond Olympic Oval. With Ko, he won the title. However, in the mixed doubles, Lee and his partner, Ha Jung-eun, lost to qualifier Liu Cheng and Luo Ying in the second round.