World number one Jannik Sinner has expressed disappointment that the World Anti-Doping Agency (WADA) is seeking a ban of up to two years for him in connection with failed doping tests over which he was originally not banned. WADA said on Saturday that it has lodged an appeal at the Court of Arbitration for Sport (CAS) to overturn a ruling from the International Tennis Integrity Agency (ITIA). “Obviously I’m very disappointed and also surprised of this appeal,” the BBC quoted Sinner as saying after beating Roman Safiullin 3-6, 6-2, 6-3 at the China Open in Beijing on Saturday. He said he was aw…