The correct answer is option 3, hurdles race. Liu Xiang is a well-known sportsman who has excelled in the hurdles race event. In this event, athletes must jump over a series of hurdles set at specific distances apart. Liu Xiang is particularly renowned for his achievements in high hurdles, where the hurdles are set at a height of 1.067 meters for men. He has represented China in numerous international competitions, including the Olympics, and has won several medals for his exceptional performance in the hurdles race.

Option 1, Table Tennis, is incorrect. Table Tennis is a different sport altogether and does not pertain to Liu Xiang`s area of expertise.

Option 2, Weightlifting, is also incorrect. Weightlifting is a strength-based sport where athletes compete to lift the heaviest weights. Liu Xiang is not known for his accomplishments in weightlifting.

Option 4, Swimming, is also incorrect. Swimming involves propelling oneself through water using arm and leg movements. Liu Xiang is not known for his achievements in competitive swimming.

Therefore, the correct answer is option 3, hurdles race.