Australian Open 2021: Injuries, retirements overshadow Day 8 as more quarter-finals set

Norway's Casper Ruud speaks to a trainer during his men's singles match against Russia's Andrey Rublev on day eight of the Australian Open tennis...

Casper Ruud was forced to retire midway through his first fourth-round match at a Grand Slam, no. 9 seed Matteo Berrettini didn’t take to court against Stefanos Tsitsipas (#5) with a worsening abdominal strain while Karolina Muchova (#25) recovered from 5-2 down in the first set to stun Belgium’s Elise Mertens – but also has a pre-existing ab injury and was wincing mid-match.
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