Atlanta, GA, USA, 24 July 2018 | AP

Alex de Minaur defeated Hubert Hurkacz on Monday in the first round of the ATP’s Atlanta Open.

The 19-year-old Australian fought back from dropping the first set to win two tiebreakers, prevailing 1-6 7-6(0) 7-6(5).

“It wasn’t the prettiest of wins but it’s a very important win for me,” De Minaur told

“I managed to dig deep, stay tough and beat a quality opponent.”

The Australian had his serve broken four times by his Polish opponent and won three less points in total but was too good in the crunch moments.

“I just tried to stay positive throughout the whole match, tried to dig deep,” De Minaur said.

The world No.68 progressed to a second-round meeting with American top seed John Isner, who received a first-round bye.

Fellow Australians Nick Kyrgios, the second seed, and fourth-seeded Matt Ebden have first-round byes.

Kyrgios teamed with Thanasi Kokkinakis in doubles on Monday but lost to John-Patrick Smith and Nicholas Monroe 7-6(2) 6-4.

James Duckworth is on court later on Monday in his opening-round match with eighth-seeded American Ryan Harrison.

Qualifiers Kokkinakis and Alex Bolt are in action on Tuesday.