Gauff upset at WTA Finals, Pegula back on track

Wimbledon champion Linda Noskova upset Coco Gauff to storm into the last four of the WTA Finals at Indian Wells on Tuesday as Jessica Pegula reignited her challenge with victory over Ukraine's Marta Kostyuk.Czech eighth seed Noskova took advantage of a shaky serving performance by Gauff to complete a 6-3, 6-3 victory in group one to book her place in the semi-finals.