NEW YORK (Reuters) - Fourth-seeded Karolina Pliskova mounted a strong defensive effort to send Russian Anastasia Pavlyuchenkova packing 7-5 6-4 in the fourth round of the U.S. Open on Monday, keeping on track her bid for a maiden major title.

The Wimbledon runner-up fired off seven forehand winners and converted on break point in the final game in the first set, before fending off six of Pavlyuchenkova's seven break point opportunities in the second set inside the Grandstand.