Darren Cahill, the coach who steered Simona Halep to Grand Slam glory, says she would never knowingly take a banned substance and claims the former world No 1 has been through "18 months of torture".
World No 1 and tournament favourite Iga Swiatek cruised into the final of the BNP Paribas Open in Indian Wells with a demolition job against Marta Kostyuk on Saturday.