Tennis: Osaka made to work by No.137 Kostyuk

Naomi Osaka beat Marta Kostyuk in three sets in the US Open Third Round. Naomi Osaka needed a third set flourish to beat Marta Kostyuk in their US Open third round meeting. Osaka trailed 2-1 in the final set against the world number 137 before reeling off the final five games of the contest to head into the last 16.