Haye was fighting as a heavyweight for only the fourth time in his career
| By Ben Dirs BBC Sport in Manchester |
Haye floored Ruiz just 25 seconds into the encounter, but the American challenger showed tremendous bravery and powers of recovery to survive.
For a moment it looked as if Ruiz was working his way back into the fight.
But the badly-marked 38-year-old was down in the fifth and again in the sixth before his corner called a halt three rounds later.
Haye's brutal victory over a man who had only been stopped once in 54 previous encounters makes inevitable a unification clash with either WBC champion Vitali Klitschko or his younger brother Wladimir, the IBF and WBO title-holder.
"I was over the moon, really happy with it - I felt I was really sharp," Haye told BBC Radio 5 live.
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"With performances like that I'll keep the fans behind me. I loved the whole occasion."
As expected, Haye, 29, sprang out of the traps at the sound of the first bell and had Ruiz over with his first real attack, a left-right combination right on the button.
The American rose but looked unsteady on his feet. Haye immediately went in for the kill, only for Ruiz to cover up well and somehow remain upright.
Ruiz was down again halfway through the round, although this time referee Guillermo Perez judged Haye had hit Ruiz on the back of the head and docked him a point.
Ruiz, a veteran of 10 world title fights and a two-time world champion, rallied well and even landed with a couple of solid right hands of his own towards the end of the round, just to remind Haye he was still there.
He may well have nicked the second before Haye upped his work-rate in the third, peppering Ruiz with ramrod jabs and rocking him repeatedly with huge right hands.
 Haye will look for a unification clash with one of the Klitschko brothers |
But Ruiz wore a pair of juddering right crosses at the start of the fifth before he was forced to take a knee after yet another massive right hand.
Ruiz, his face by now masked with blood, was down for a fourth time in the sixth, this time courtesy of a chopping right hook, and the challenger's trainer Miguel Diaz indicated that the next round might be his last hurrah.
But Haye coasted the seventh, meaning Ruiz, who never stopped coming forward despite the damage he was sustaining, was sent out again.
A scything uppercut had Ruiz backpedalling at the start of the eighth and, after another tremendous barrage it looked like he might go over again. But Haye, feeling the pace himself, stood off.
After more one-way traffic in the ninth, Diaz finally waved the white flag two minutes and one second into the round to save his man further punishment.
With his victory, Haye becomes the first British fighter to defend a heavyweight world title on home soil since Lennox Lewis beat South Africa's Francois Botha at the London Arena in 2000.
When Haye, whose record now reads 24 wins (22 knockouts) and one defeat, beat Nikolay Valuev to claim the WBA belt last November, there was a rematch clause in the contract, but the hope is the Russian will be paid to step aside.
Haye wants a fight against either Klitschko to take place at London's Wembley Stadium, although the Ukrainian siblings would prefer it to happen in their adopted Germany where they command huge television audiences and would have little problem filling a football stadium.
Haye was all set to fight Wladimir in Gelsenkirchen last June before Haye pulled out with a back injury, but the Englishman will use the impressive nature of his victory over Ruiz to claim he is now the bigger draw.
Earlier in the evening, Briton George Groves stopped Ghana's Charles Adamu in the sixth round to win the Commonwealth super-middleweight title.
Colin Lynes failed to make it a successful British double after being counted out in the eighth round of his Commonwealth light-welterweight title challenge against Ajose Olusegan of Nigeria.
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