Serena Williams is on course to defend the title she won last year
Serena Williams crushed world number one Justine Henin in the quarter-finals of the Sony Ericsson Open in Miami.
In a repeat of last year's final, the American again ran out the winner, although this time it was a humiliating 6-2 6-0 defeat for Belgian Henin.
Serena will meet Svetlana Kuznetsova in the semis after the Russian 2006 champion beat her sister Venus 6-4 6-4.
In the men's event, Roger Federer and Rafael Nadal both went through, while Andy Roddick beat Julien Benneteau.
Top seed Federer beat Argentina's Jose Acasuso 7-6 (7-5) 6-2, while second seed Nadal overcame Frenchman Paul-Henri Mathieu 6-4 6-4.
I was too defensive, for sure. I didn't have really any courage to do something else
Federer, who hit 31 winners and lost just 10 points on his serve, said: "It's always nice when you feel well from the beginning on your serve."
Roddick's 4-6, 6-3, 6-2 win over France's Benneteau means he will now meet Federer, a man he has failed to beat in their last 11 meetings.
Fourth seed Nikolay Davydenko came from behind to beat Mario Ancic 4-6 6-3 7-5, while ninth seed James Blake had a comfortable 6-3 6-3 win over Radek Stepanek.
And Igor Andreev beat Guillermo Canas 6-4 7-6 (8-6) to set up a match against Tomas Berdych, who swept past Dmitry Tursunov 6-2 6-2.
Williams went into the big match of the day having lost her past three meetings with Henin, at last year's French Open, Wimbledon and US Open.
But the American, currently ranked eighth in the world, had the memory of a stunning win in Miami a year ago and is going for a fifth title at the event.
After failing to convert three break points in the opening game it was all downhill for Henin, who made five double-faults including one on match point.
Last year, Williams saved two match points on her way to the title, but this time Henin lost 10 straight games as the match raced away from her.
Asked if she had expected to win so easily, Williams said: "Not over the number one player in the world who was clearly in the best form last year.
"Everything worked well for me. I'm feeling better and I've keeping working hard.
"Being aggressive and not being 12 feet behind the baseline works."
Henin admitted: "I was too defensive, for sure.
"Against this kind of player, you don't have any chance if you play that game, and I didn't have really any courage to do something else.
"When you're on the court, it's not that easy. Now I can say it wasn't enough."