In January, Lee lost in the final of Korea Open to Chen Long, his fourth straight defeat by the Chinese. He recorded his tenth Malaysia Open title a week later. Soon after the triumph, he announced this would be his last Malaysia Open outing, as he would assess his condition after the Asian Games and may retire if the results are not good.

However, his form improved and he won his third All England Open and India Open titles, although he was beaten by Simon Santoso in final of the Singapore Open. In the Thomas Cup, Lee won every match he played. Malaysia reached the finals, but lost to Japan with a score of 3–2.

In June, he won the Japan Open for the third consecutive year and fifth time overall. He then lost in the semifinals of the Indonesia Open, ending his hopes of nine straight Super Series finals. Due to a serious hamstring injury, Lee withdrew from the 2014 Commonwealth Games in July, also ending his hopes of being the first men's singles shuttler to win 3 back-to-back gold medals at the games.

Lee resumed play in August where he finished second for the third time at the World Championships, losing to Chen Long of China in straight sets. He again lost to Chen in the semifinals of Asian Games team competition, and to Lin Dan in the semifinals of the singles event a few days later.

2014[edit]
2009[edit]
2015[edit]
Achievements[edit]