Angelique Kerber said being forced into hard hotel quarantine contributed to her demise at the Australian Open Monday after the former champion crashed out to Bernarda Pera, 26. 

The 2016 Australian Open winner, seeded 23 at Melbourne Park, was in disarray as she succumbed 0-6, 4-6 in just one hour and 10 minutes against American Pera, ranked 63.