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Samantha Stosur will meet fellow Australian and 11th seed Ashleigh Barty after the pair both advanced to the third round at the Miami Open.

Samantha Stosur and Ashleigh Barty have booked an all-Australian third-round clash with twin victories at the Miami Open.

It was a good day on the hardcourts for the Aussies, with Stosur providing the first upset of the tournament by knocking off 16th-seeded American Madison Keys 6-4 4-6 6-4 on Friday.

The former US Open champion will meet Barty in the third round after the 11th seed easily dispatched Ukraine's Dayana Yastremska 6-4 6-1 in just over an hour, winning 73 per cent of first-serve points.

Their victories come as fellow Aussie Daria Gavrilova crashed out of the tourament with a 6-1 6-4 opening-round loss to Slovakian Vikotoria Kuzmova.

The 48th-seed took nearly an hour and 40 minutes to dispatch Gavrilova, who won just 45 per cent of her first-serve points.

On the centre court, three-time Miami Open champion Venus Williams eased past Slovenian qualifier Dalila Jakupovic 7-5 6-3.

Lagging 5-4 in the first set, Williams surged into gear, breaking her opponent three times to claim victory in one hour and 18 minutes.

The 38-year-old was impressed by her younger opponent, who was playing in her first WTA premier event.

"She really plays the angles well and is definitely a real competitor," Williams said.

"I was just trying to get a feel for what her shot selection is like."

Another tennis sibling was less fortunate, with Mari Osaka - older sister of world No.1 Naomi - falling 6-2 6-4 to American wildcard Whitney Osuigwe.

New Indian Wells champion Bianca Andreescu battled against Irina-Camelia Begu in their second meeting this month, losing the first set before clawing her way back to triumph 4-6 7-6(2) 6-2.