Serena Williams overcame a scare against Dutch qualifier Arantxa Rus to reach the Western and Southern Open third round in New York.

American Williams, 38, stopped Rus serving out the match at 6-5 before winning 7-6 (8-6) 3-6 7-6 (7-0) in almost three hours.

Two-time champion Williams will play Greece's 13th seed Maria Sakkari in the third round.

Fourth seed Naomi Osaka of Japan beat Karolina Muchova 6-7 (5-7) 6-4 6-2.

The world number 10 was playing her first match since the WTA resumed after it was suspended because of the coronavirus pandemic.

Osaka will face 16th seed Ukrainian Dayana Yastremska in round three.