Fourth seed Caroline Wozniacki's US Open campaign came to an end in the second round on Thursday as she was beaten 4-6, 7-5, 6-7 (1) by Petra Cetkovska.
A beaten finalist last year, Wozniacki's form this season has been patchy at best, with a final four spot at New Haven prior to the US Open coming on the back of three consecutive opening round defeats. And the Dane's vulnerability was once again on show on Thursday.
Wozniacki started the match strongly and broke Cetkovska in the second game of the match en route to taking a 3-0 lead. But, Cetkovska broke Wozniacki to reduce the deficit to 3-2. Consecutive breaks followed before Cetkovska took control and broke Wozniacki once again before closing out the first set 6-4 in 43 minutes.
In the second set it was Cetkovska who raced out to a 3-0 lead after breaking Wozniacki twice. The Dane responded by breaking back in the fourth game before Cetkovska broke back immediately to go 4-1 up. However, Wozniacki refused to go down without a fight as she broke Cetkovska three more times and won six of the next seven games to clinch the second set 7-5.
After a second set in which a hold of serve was a rarity rather than the norm, both players were vastly improved on serve in the decider, with neither woman able to fashion a break – although Cetkovska was forced to stave off three match points when serving to stay in the match at 5-6.
A tiebreak was required to separate the pair, and it was Cetkovska who took charge, winning six points in a row to take the breaker 7-1 and with it the match.
Cetkovska will face 26th seed Flavia Pennetta in the third round after the 33-year-old Italian beat Monica Niculescu 6-1, 6-4.
Wozniacki was not the only seeded player to fall on Thursday as ninth seed Garbine Muguruza was defeated 6-7 (7), 7-6 (4), 2-6 by Johanna Konta.