Miami, FL, USA, 27 March 2015 | tennis.com.au/AFP

Sam Stosur has overcome a second-set blip to storm into the third round of the Miami Open.

Facing French qualifier Pauline Parmentier, Stosur began strongly and finished in even more dominant fashion to record a 6-1 3-6 6-0 win.

She will next face 16th seed Venus Williams, who beat Polish qualifier Urszula Radwanska in straight sets.

Stosur has defeated Williams just once in seven career meetings, yet the last time they met was in 2012.

The Aussie struggled on serve throughout her match against Parmentier on Miami’s Court 2, landing just 55 per cent of her first serves and dishing up four double faults.

Yet she was strong on the return, creating 13 break point chances and converting six.

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Earlier on Thursday, German Alexander Zverev knocked Australian Sam Groth out of the men’s event.

The 17-year-old Zverev won the first-round match 7-5 6-7(5) 6-4 to send the world No.69 Groth home after the first round.

In a late night match on Stadium court, Lleyton Hewitt battled for nearly three hours before falling to Brazil’s Thomaz Bellucci.

Bellucci triumphed 7-5 6-7(2) 6-4, moving through to the second round where he will meet 19th seed Pablo Cuevas.