Atlanta, USA, 25 July 2019 | AAP

Australian Alexei Popyrin is through to the quarterfinals of the Atlanta Open after defeating Frenchman Pierre-Hugues Herbert.

Popyrin, 19, took one hour and 26 minutes to beat Herbert, the hard-court tournament’s fourth seed, 7-5 6-3 in the second round on Wednesday (local time).

The world No. 95 will next face Britain’s Cameron Norrie, who defeated South Korea’s Soonwoo Kwon 6-3 6-4 in the second round.

Australia is guaranteed at least two quarterfinalists in Atlanta when countrymen Matthew Ebden and Bernard Tomic face off on Thursday for a chance to join Popyrin in the last eight.

The winner could then be set for a battle with another compatriot if 20-year-old Alex de Minaur defeats American Bradley Klahn in the second round.

Britain’s Dan Evans also made the quarterfinals after he defeated Moldovan sixth seed Radu Albot 7-6(5) 5-7 6-2.

Albot managed to convert just four out of 19 break point opportunities, while Evans converted five out of six. Evans will face the winner of the all-American clash between John Isner and Reilly Opelka.