Jannik Sinner and Iga Swiatek were both subject to doping cases last year, which has overshadowed their participation at the Australian Open.

Iga Swiatek beat "lucky loser” Eva Lys 6-1, 6-0 and has ceded just 11 games through four matches heading into her quarterfinal against No. 8 Emma Navarro, who won her fourth consecutive three ...