LINZ, Austria – Top seed Garbiñe Muguruza retired in the deciding set to hand Viktorija Golubic a semifinal spot at the Generali Ladies Linz.

Muguruza had narrowly taken the first set, 7-5.

Golubic struck back 6-3 in the second set, though, having raced to a 4-0 lead as she broke the Muguruza serve twice.

And after Muguruza suffered a fall and sustained an apparent sprain to her ankle, she looked less and less comfortable, eventually withdrawing with the score at four games all in the deciding set.