De Minaur succumbs to big Isner serve

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Alex de Minaur has lost to Wimbledon semi-finalist John Isner at the Atlanta Open

Australia's Alex de Minaur has been eliminated in the second round of the Atlanta Open, falling to defending champion John Isner.

The 19-year-old, who is the youngest player in the field, lost in straight sets to the Wimbledon semi-finalist on Wednesday (Thursday AEST) 6-3 6-2.

The American took advantage of his big serve, dishing out 15 aces in a match lasting just over an hour.

The top seed will now face Mischa Zverev, older brother of world No.3 Alexander, in the quarter-finals.

Zverev won his match against Russian veteran Mikhail Youzhny 6-4 6-2.

Fellow Australian Alex Bolt was eliminated on Tuesday (Wednesday AEST), missing out on a spot in the round of 16 after falling to Marcos Baghdatis.

The world No.169 was no match for the Cypriot who powered to a 6-4 6-1 victory on a cloudy afternoon in Georgia.

World No.23 Hyeon Chung also progressed to the round of 16 after he was pushed into a tiebreaker by plucky American Taylor Fritz.

The South Korean ended up beating the 20-year-old 6-4 7-6 (7-5) and was joined by American world No.53 Ryan Harrison.

Harrison recovered from a first set loss to beat Slovakia's Lucas Lacko 2-6 6-2 6-3.

Nick Kyrgios takes on American youngster Noah Rubin while Matthew Ebden will play Donald Young for a place in the quarter-finals.