After CAS hearing, Chinese swimmer Sun Yang hopes to be at Tokyo 2020 Chinese multiple Olympic and world swimming champion Sun Yang, facing a ban of up to eight years for missing an out-of-competition test says the process has caused him "harm" and says he hopes he can go on to the Tokyo Olympics in 2020. Attending a one-day open hearing of the Court for Arbitration of Sport (CAS), Sun, accused of using a hammer to smash a vial containing his own blood sample, blamed testers for being unprofessional and ignoring protocol. IMAGES AND SOUNDBITES