LONDON - Defending champion Lin Dan beat great rival Lee Chong Wei in a gripping men's final as China sealed a historic clean-sweep of all five Olympic badminton titles on Sunday. Lin battled back from a game down to win 15-21, 21-10, 21-19 and became the first men's singles player to win the Olympic title twice. Cai Yun and Fu Haifeng won the men's doubles final 21-16, 21-15 against Denmark's Mathias Boe and Carsten Mogensen, clinching the fifth title for China to make it the first country to take all five since badminton's Olympic debut in 1992.