Jan 7 (Reuters) - The U.S. reached ‌the semi-finals of the United Cup mixed team tournament after ‌beating Greece 2-1 in Perth on Wednesday, as Coco Gauff defeated ‌Maria Sakkari before returning to clinch victory for the defending champions in the doubles.

Gauff, a two-times Grand Slam champion, beat Sakkari 6-3 6-2 in an hour and 26 minutes to put ‍the U.S. in front.