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.
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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.
