Los Cabos, Baja California Sur, Mexico, 3 August 2017 | AAP

Australian comeback star Thanasi Kokkinakis has won a third-set tiebreak against Peter Polansky to reach the quarterfinals of the Los Cabos Open in Mexico.

Kokkinakis won the second-round clash 4-6 6-3 7-6(4) and will face the winner of world No.23 Albert Ramos Vinolas’s clash with Taylor Fritz.

Kokkinakis, 21, who is two months into a full-time ATP tour comeback after almost two years of crippling injuries, claimed victory over his Canadian opponent in just over two hours.

Meanwhile, top seed Tomas Berdych was too strong for Australian youngster Akira Santillan, ranked 168th in the world.

World No.14 Berdych claimed the 6-3 6-1 victory in 56 minutes.

Later on Wednesday night, No.4 seed Feliciano Lopez ended Matt Ebden’s run with a 6-4 6-4 victory in the second round.