MELBOURNE, Jan ‌22 (Reuters) - Defending champion Madison Keys overcame struggles with ‌her game to advance to the third round ‌of the Australian Open with a 6-1 7-5 win over fellow American Ashlyn Krueger at Melbourne Park on Thursday.

The 30-year-old was once ‍again less than convincing in her ‍victory, two days after ‌labouring in a first-round win over Ukrainian Grand Slam debutant ‍Oleksandra ​Oliynykova.