Rybakina uncertain ahead of her Round of 16 match: "It doesn't look good".

Elena Rybakina qualified for the last 16 of the Australian Open by beating Dayana Yastremska, despite an apparent back injury that prevented her from completing the match at 100%.

The world No. 6, who had put in a solid performance so far, is scheduled to face Madison Keys in her next match.

An opponent in great form, as the American, recently crowned champion in Adelaide, is on an eight-match winning streak.

During a very quick press conference, Rybakina was not positive about the injury: "I don't know yet, but it's not good, because it's in the lower back.

We're hoping to do everything we can over the next day and a half. But to be honest, it doesn't look good."