(CNN) -- Number one seed Caroline Wozniacki continued her imperious form at the U.S. Open as she demolished Kai-Chen Chang to reach round three.
The Dane took just 47 minutes to beat her unseeded opponent from Chinese Taipei 6-0 6-0.
Wozniacki is searching for her first grand slam title, and aiming to go one better than last year when she lost to Kim Clijsters in the final at Flushing Meadows.
Her powerful serve and ground strokes were too much for Chang, as she wrapped up the opening set in just over 20 minutes.
It was a similar story in the second set as Wozniacki kept up her relentless hitting, meaning Chang failed to put a single game on the board.
Wozniacki will now face another opponent from Chinese Tapei in the next round -- Yung-Jan Chan -- after she beat Austrian Tamira Paszek 6-3 6-3.
Elsewhere in the draw, Maria Sharapova recorded a victory over her Czech opponent Iveta Benesova, taking the match 6-1 6-2.
Despite the impressive result Sharapova, a the former U.S. Open champion made a series of unforced errors, including 10 in the opening set.
Vera Zvonareva battled into round three but was made to work hard by unseeded Sabine Lisicki.
The Russian, who lost in the final at Wimbledon to Serena Williams, reached the third round for the seventh time in eight appearances at Flushing Meadows after beating her German opponent 6-1 7-6.
Lisicki, who missed five months of the season with an ankle injury, was overpowered in the opening set on the Arthur Ashe court and though she regained her composure in the second, she failed to win the tie-break.
Svetlana Kuznetsova ensured there would be a strong Russian presence in the next round, disposing of unseeded Latvian Anastasija Sevastova 6-2 6-3.
Fourth seed Jelena Jankovic had to fight for her place in the third round, eventually defeating Croatia's Mirjana Lucic 6-4 3-6 6-2.
The Serb will now face Estonia's Kaia Kanepi, who overcame Uzbekistan's Akgul Amanmuradova 6-2 6-4.
Poland's Agnieszka Radwanska was the highest-profile casualty of day four, crashing out 2-6 6-1 6-4 to China's Shuai Peng.
Despite winning the opening set, the ninth seed lost the final two, and her hopes of a first grand slam singles title at Flushing Meadows came to a premature end.
Teenager Beatrice Capra caused an early upset on day four as she ousted 18th seed Aravane Rezai 7-5 2-6 6-3 in only her second grand slam match.
The 18-year-old American is ranked 371 in the world and is playing in only her fourth event at professional level.
Elsewhere, Switzerland's Patty Schnyder disposed of 22nd seed Maria Jose Martinez Sanchez, from Spain, 7-6 6-4 while Belgian 15th seed Yanina Wickmayer beat Julia Goerges from Germany 6-4 7-5.