Danish tennis star Caroline Wozniacki has bowed out of the ongoing US Open tournament in New York after her shock second-round straight sets defeat to Lesia Tsurenko of Ukraine.

The second seed was beaten 6-4 6-2 by the world number 36.

The Australian Open champion’s defeat comes on the back of world number one Simona Halep’s first round exit.

After her defeat, Wozniacki, 28, said: “She played the game I was supposed to play.”

“This part of the season is usually a part of the season I really look forward to, one where I really play well.” She added.

German fourth seed Angelique Kerber is through to the third round after overcoming a second-set wobble to beat Johanna Larsson of Sweden

She saw off her opponent in three sets 6-2 5-7 6-4 to setup a meeting with Dominika Cibulkova of Slovakia.

Cibulkova overcame a two-point deduction for returning late from a heat break during her match with Hsieh Su-wei of Taiwan.

She won 7-6 (7-3) 4-6 6-4 in three sets to secure a last 32 meeting with Kerber.

On her punishment, Cibulkova said: “[The umpire] told me I was one minute late. I’m getting two points’ penalty. You cannot be serious.”

“It took me, I think, more than three minutes walking through the people, because there were so many fans and so many people. I couldn’t believe it.” She added.

Last year’s finalists and home favourites Madison Keys will face Victoria Azarenka of Belarus in the third round after beating compatriot Bernarda Pera 6-4 6-1 in their second round clash.

Keys was beaten by another American Sloane Stephens in last year’s final.