World No. 2 Aryna Sabalenka’s preparations for the Australian Open suffered another setback on Tuesday with a shock 7-5, 1-6, 5-7 defeat by Sweden’s Rebecca Peterson in the first round of the Adelaide International.

The Belarusian top seed committed 21 double faults in a performance full of errors which consigned her to a second defeat in as many matches after being beaten by Kaja Juvan, then ranked world number 100, in Adelaide last week.

“Honestly, this was the weirdest match I’ve ever played,” Peterson said after her win over the two-time grand slam semi-finalist in two hours 18 minutes. It was tough staying in there, but I knew she was struggling a lot.”

Peterson, ranked 93rd in the world, will next face American Madison Brengle, who beat Russian Anastasia Potapova 7-5, 4-6, 6-1.

Later on Tuesday, American third seed Coco Gauff swiftly dismantled Katerina Siniakova in just over an hour 6-1, 6-2. “She’s not an easy player to play, she hits a lot of balls back and keeps fighting,” the 17-year-old said.

In the men’s ATP 250 tournament, local hope Thanasi Kokkinakis proved to be too much for Frenchman Benoit Paire, winning 6-4, 6-0.

“Playing Paire is always a tricky one, you never know what you’re going to get,” Kokkinakis said.