Lee started the year with the title in all events he took part, his first treble in the Super Series titles. He gained his first ever Korea Open crown, sixth Malaysia Open, and defeated Kenichi Tago to win the oldest and prestigious badminton championship in the world, the All England Open, his first since he took part in 2004.

Lee participated in the Thomas Cup in his home ground. He managed to defeat Kenichi Tago and take the first point, despite Malaysia's eventual loss (2–3) to Japan. In the quarter-finals, he beat Peter Gade, thus helping to secure Malaysia's place in the semi-finals. In the semi-finals against China, Lee was defeated by Lin Dan, which ended his 18-match unbeaten record since the start of the year.

In June, Lee participated in the Singapore Open losing in the quarter-finals. However, Lee bounced back winning the Indonesia Open, Malaysian Open Grand Prix Gold in July, and Macau Open in August. In late August, Lee suffered a shock exit in another attempt for the World Championships, but was beaten by Taufik Hidayat in the quarter-finals. Misbun cited that the loss was due to the back injury he picked-up after the match against Rajiv Ouseph in the third round. On 26 September, Lee beat his archrival Lin Dan in the Japan Open, the only title not taken by Chinese players in the tournament.

In October, he helped Malaysia to beat India to defend the gold medal at the 2010 Commonwealth Games mixed team event, then he successfully defended his gold medal once again in the singles event a few days later. The following month he won a silver medal at the Asian Games. Despite beating reigning World Champion Chen Jin in the semi-final, Lee once again tasted defeat at the hands of his great rival, Lin Dan, in the final. At season's end, he won his second consecutive Hong Kong Open title, and third consecutive Super Series Master Finals title, where the tournament was held in January 2011.

2014[edit]
2002–2007[edit]
2010[edit]
2013[edit]