An otherwise straightforward quarterfinal victory for Medvedev took a confusing twist as a line call debate got heated—and a challenge from Ricardas Berankis only added to the chaos.

Bernarda Pera also stayed hot by maintaining her sensational set streak with another emphatic win Wednesday.

The Spaniard defeated Ricardas Berankis, 6-2, 7-5, in his first tour-level singles match in five months.