Serena Williams wasted little time in booking her place in the WTA Miami Open quarter-finals as she defeated Svetlana Kuznetsova 6-2 6-3 to stay on track for a third straight title.
The world number one was in fine form throughout at Crandon Park on Monday, recording 29 winners.
Williams had to show her defensive skills to fend off four break-point chances against the Russian - who had beaten her opponent twice in the past - but she remained largely untroubled and progressed to the last eight in just over 75 minutes.
"Playing Svetlana, I know she's super tough - we always have super tough matches," Williams said.
"The last time we played I was just fighting my hardest and I was barely able to win, so today I knew I had to come out super, super focused, and I really just tried to do the best I could out there."
The 19-time grand slam champion has now won 18 consecutive matches, while she is also on a 15-match running streak at the Miami Open.
Next up for Williams is Sabine Lisicki, who dumped 11th seed Sara Errani 6-1 6-2.
There was also success for Serena's sister Venus Williams, who hit 43 winners on her way to a superb 6-3 7-6 (7-1) victory over fourth seed Caroline Wozniacki.
Wozniacki subsequently slips to a 7-0 head-to-head record against her fellow former world number one.
Awaiting Venus in the last eight is Carla Suarez Navarro, who outlasted seventh seed and 2012 champion Agnieszka Radwanska in a come-from-behind 5-7 6-0 6-4 triumph.
German Andrea Petkovic and Czech Karolina Pliskova will go head-to-head in the quarter-finals.
Petkovic held off a spirited second set comeback from Ekaterina Makarova to win 6-1 7-5, while rising star Pliskova accounted for wildcard Daria Gavrilova 6-3 6-2.
Meanwhile, American Sloane Stephens downed Belinda Bencic 6-4 7-6 (7-5) to set up a meeting with third seed Simona Halep.
Halep of Romania finally beat Flavia Pennetta at the fourth attempt, triumphing 6-3 7-5.