Serena Williams remains on course for a record‑equalling 24th Grand Slam title despite needing medical attention in a win over Petra Martic at the US Open.
Williams reached the quarter‑finals in New York with a 6‑3 6‑4 victory against the 22nd seed.
The six‑time champion needed her ankle re-strapping in a medical timeout after turning awkwardly during the final set.
Williams was able to return to the court and win the match in dominant fashion.
She faces China's Wang Qiang next after the 18th seed beat world number two Ashleigh Barty in the last 16.
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