|2018 Australian Open|
|Dates: 15-28 January Venue: Melbourne Park|
|Coverage: Watch highlights on BBC Two, the BBC Sport website and app. Live commentary on the best matches on BBC Radio 5 live, 5 live sports extra and online.|
Fifth seed Dominic Thiem has been knocked out of the Australian Open in the fourth round by world number 97 Tennys Sandgren.
The Austrian lost 6-2 4-6 7-6 (7-4) 6-7 (7-9) 6-3 in three hours 55 minutes.
Sandgren, 26, had never won a match at a Grand Slam before this event and is only the second man in the last 20 years to reach a quarter-final on his Melbourne debut.
The American will play Novak Djokovic or Hyeon Chung in the last eight.
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