Kevin's dominant hand in badminton is right. He is a right-handed player who uses his right hand to grip the racket and his left hand to hold the shuttlecock. This gives him an advantage in terms of power and control, as he can generate more force with his right hand and can more easily direct the shuttlecock where he wants it to go.
The Kevin Sanjaya Sukamuljo Phenomenon: How Well Do You Know the Indonesian Badminton Maestro?