Millman through to Mexican Open quarters February 28, 2019 by AAP

ACAPULCO DE JUAREZ, AAP - Australia's John Millman is through to the quarterfinals of the ATP tour's Mexican Open with an emphatic straight sets victory over German Peter Gojowczyk in Acapulco.

Millman blitzed the world No.87 6-0 6-2, at one stage winning eight games in succession.

The world No.44 converted six break points and delivered the contest's only two aces to set up a quarter-final clash with third-seed John Isner.

Big-serving American Isner eliminated compatriot Sam Querrey 6-4 6-4.

Millman's win was his second comfortable triumph - the eighth seed beat Spaniard Marcel Granollers 6-3 6-4 in the opening round.

Fifth seed Alex de Minaur boosted Australia's presence in the quarter-finals when Feliciano Lopez (Spain) withdrew before their second round match.

Nick Kyrgios can join the duo if he can upset top seed Raphael Nadal on centre court during the night session.

Switzerland's Stan Wawrinka also beat seventh-seeded American Steve Johnson 7-6 (7-5), 6-4 to progress to the last eight.