Third-seed Dominika Cibulkova comfortably overcame Laura Siegemund 6-2, 6-0 to progress to the second round of the 2017 Apia International in Sydney on Monday.
Cibulkova was the highest seed in action in the main draw and proved far too strong against Siegemund, who was dismantled on Court 1.
Elsewhere there were wins for Caroline Wozniacki and Johanna Konta, while in the men's draw, fifth-seed Philipp Kohlschreiber ended the challenge of Fabio Fognini.
|Apia International Sydney 2017: Monday Results|
|Anastasia Pavlyuchenkova bt Samantha Stosur||6-3, 6-1|
|(10) Caroline Wozniacki bt Monica Puig||6-3, 2-6, 6-4|
|(3) Dominika Cibulkova bt Laura Siegemund||6-2, 6-0|
|(6) Johanna Konta bt Arina Rodionova||6-3, 6-4|
|CoCo Vandeweghe bt (8) Elena Vesnina||6-2, 4-0 (ret)|
|(9) Roberta Vinci bt Maria Sakkari||6-4, 6-0|
|Barbora Strycova bt Ekaterina Makarova||6-3, 7-5|
|Christina McHale bt Kateryna Bondarenko||4-6, 7-5, 6-2|
|Ying-Ying Duan bt Irina Falconi||7-5, 3-6, 6-0|
|Daria Gavrilova vs. Donna Vekic||6-3, 7-6|
|Matthew Barton bt Kyle Edmund||7-6 (7-3), 7-6 (7-5)|
|(5) Philipp Kohlschreiber bt Fabio Fognini||6-4, 6-4|
|Gastao Elias bt Christopher O'Connell||6-7 (3-7), 6-4, 6-1|
|Paolo Lorenzi bt Florian Mayer||7-6 (7-4), 4-6, 7-6 (7-5)|
|Daniel Evans bt Thiago Monteiro||6-3, 4-6, 6-3|
|Apia International Sydney 2017: Tuesday Schedule|
|Ken Rosewall Arena|
|Alex De Minaur||vs.||Benoit Paire|
|(1) Angelique Kerber||vs.||Daria Kasatkina|
|Daria Gavrilova||vs.||(6) Johanna Konta|
|Thanasi Kokkinakis||vs.||Jordan Thompson|
|Show Court 1|
|(3) Dominika Cibulkova||vs.||Eugenie Bouchard|
|(6) Gilles Muller||vs.||Alexandr Dolgopolov|
|Santiago Giraldo||vs.||(8) Marcel Granollers|
|Christina McHale||vs.||(2) Agnieszka Radwanska|
|Anastasia Pavlyuchenkova||vs.||(5) Svetlana Kuznetsova|
|Mischa Zverev||vs.||Nicolas Almagro|
|(10) Caroline Wozniacki||vs.||Yulia Putintseva|
|CoCo Vandeweghe||vs.||Ying-Ying Duan|
|Barbora Strycova||vs.||(9) Roberta Vinci|
|Andrey Kuznetsov||vs.||(7) Martin Klizan|
|(1) Sania Mirza & Barbora Strycova||vs.||Andrea Hlavackova & Shuai Peng|
|Liezel Huber & Maria Sanchez||vs.||Daria Gavrilova & Daria Kasatkina|
It was only the second time Cibulkova and Siegemund had faced each other on court, with the former winning their first encounter in Wuhan, China, in September 2016.
And it was Slovakia star Cibulkova who showed her intent from the start, racing into a 3-0 lead in the opening set.
Siegemund, ranked 29th in the world, offered some resistance to break serve and get back to 3-2, but she couldn't build on that momentum as she lost her own service game twice more to hand Cibulkova the set.
Matters were to get worse for Germany's Siegemund, and she was completely steamrollered in a 6-0 second set, which puts Cibulkova through to face Eugenie Bouchard in the next round.
Per the tournament's website, Cibulkova said of the match afterwards:
I just felt pretty good, you know, overall when I practice here, and of course match and practice is different story, but I was ready.
I knew it was going to be tough, but I had very good answers for her good shots. I was really solid, and when I had the chance, I was going for my shots.
The WTA's Twitter account showed how Cibulkova sealed the victory:
Caroline Wozniacki, the 10th seed, took over two hours to see off the challenge of Olympic champion Monica Puig.
The first set saw Wozniacki take a commanding lead that she held on to, winning it 6-3 on her fourth set point.
Puig fought back well in the second, stunning her opponent from Denmark by storming into a 4-0 lead. Although Wozniacki rallied to win a break back, Puig comfortably closed the set out 6-2 to take it into a decider.
The final set was a real battle, taking just under an hour. It was Wozniacki who held her nerve to claim it 6-4 and move through to a matchup with Yulia Putintseva.
Britain's Johanna Konta, number six seed in Sydney, beat Arina Rodionova in straight sets.
After sharing the first four games, Konta wrested control to edge ahead and take the first set 6-3.
Konta, born in Sydney, continued her form into the second set to ease into a 5-1 lead. But Rodionova showed her stomach for a fight to peg it back to 5-4 and put the pressure on Konta to serve it out. And she did just that to set up a clash with Daria Gavrilova.
In the men's section, Kohlschreiber had to tough it out against Fognini to win in straight sets, 6-4, 6-4.
After a scrappy start that saw both players drop their serve, Kohlschreiber held firm to lead the match. And it was the German who took the initiative early on in the next set and fought off the stubborn Fognini to go through.