Grand-slam winners Coco Gauff and Elena Rybakina progressed into the last eight on Monday.
British number one Katie Boulter missed out on a place in the Miami Open quarter-finals after she lost in straight sets to Victoria Azarenka.
A marathon first set went the way of former world number one Azarenka and it proved pivotal with Boulter unable to keep up her level in set two before she lost 7-5 6-1.Two-time Australian Open champion Azarenka looked on course to cruise past the recent San Diego Open winner when she established a 5-2 lead in the first set.
It spurred Boulter on and she broke back against the Belarusian before she held again to level at 5-5.
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