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 transform her serve with the entire tennis world watc hing, but the one quality that will never evade her is her fighting spirit.Under far from ideal circumstances, Gauff’s mental toughness continues to guide her through the Miami Open draw and to her best ever result at her home town tournament. She navigated a path into the semi-finals for the first time in her career with an arduous 6-3, 1-6, 6-3 win over Bencic. Continue reading... ...read more read less