Amir Khan will fight with a heavy heart in his return to action. Singapore’s Khan (13-7) takes on South Korean contender Dae Sung Park (10-2) at “ONE Championship 125: Collision Course II,” which airs today via tape delay, where he will be fighting not just for the victory, but for the memory of his father, who he recently lost to brain cancer. “I’m sad, but I’m trying to stay strong at the same time,” he told ONE Championship ahead of fight night in Singapore