Coco Gauff battles imposter syndrome on way into Miami Open semi-final

American No 4 seed beats Belinda Bencic 6-3, 1-6, 6-3 in quarter-finalGauff next faces 13th seed Karolína Muchová for a place in finalCoco Gauff may be struggling with an unfamiliar arm injury, indifferent form and the pressure of attempting to...