Noskova beats Gauff to reach WTA Finals semi-finals as Pegula stays alive

• Czech defeats Gauff 6-3, 6-3 to reach last four

• Pegula eliminates Kostyuk with straight-sets victory

• Gauff and Pegula remain in contention for final berth

Linda Noskova secured her place in the semi-finals of the WTA Finals with a 6-3, 6-3 victory over Coco Gauff on Tuesday, while Jessica Pegula knocked Marta Kostyuk out of the season-ending tournament with a straight-sets win.

The Czech, who beat Kostyuk in her opening match, has won both encounters without dropping a set and is assured of advancing to the knockout stage. Gauff and Pegula are both 1-1, with the final round-robin matches on Thursday set to determine who joins Noskova in the last four.