Boxing Video: Top 10 One-Punch KOs Over Last 2 Years, Including Pacquiao-Hatton

May 2, 2009 will be a date Pacquiao fans will always remember. He earned his most violent and spectacular knockout of his career over Ricky Hatton.

From 2009 to 2011, boxing fans have been treated to some of the very best knockouts in recent memory. Single-punch KOs are always want fans want to see, and there was no shortage of them.

At the highest levels of the sport, the top boxers have been scoring knockouts over very good opponents and the pound-for-pound stars.

When Manny Pacquiao and Shane Mosley meet face-to-face May 7th, will we see another spectacular KO? We will have to tune in to find out.

No. 10 Arthur Abraham KO Jermain Taylor (2009)

The opening night of the Showtime Super Six Super-Middleweight Tournament featured Jermain Taylor and Germany's own Arthur Abraham.

Abraham possesses some of the very best knockout power in his right hand. He has used it to knock out many of his opponents, including many in the last and final round.

As the video shows, he still has KO power in the last and final round of any match.

No. 9 Robert Helenius KO Samuel Peter (2011)

Former WBC world heavyweight champion Samuel Peter was coming off a 10th round TKO loss to heavyweight kingpin Wladimir Klitschko.

His opponent was up-and-comer Robert Helenius, a 27-year-old from Finland.

Helenius was only 14-0 going into this bout against a top opponent, but Peter didn't have much left after suffering devastating defeats to both Klitschko brothers.

No. 8 Jhonny Gonzalzez KO Santos Marimon (2010)

Current WBC featherweight champion Jhonny Gonzalez has an incredible 76 percent knockout ratio. He has knocked out 42 of his 48 opponents, including Hozumi Hasegawa.

In this fight, he took on Santos Marimon for a chance at the WBC featherweight title, which he would eventually claim from Hasegawa.

No. 7 Audley Harrison KO Michael Sprott (Rematch, 2010)

Despite his terrible performance against David Haye, Audley Harrison does have the potential to produce some vicious knockouts, and he has done it numerous times.

In a rematch versus Michael Sprott, Harrison produced yet again another vicious KO. Their first fight had ended by a KO produced by Harrison, and the same thing happened again here in the very last round of the fight.

No. 6 Antonio Pitalua KO Jose Reyes (2009)

Hard-punching Anthony Pitalua has an 80 percent knockout ratio among his 50 victories.

This 2009 bout versus Joe Rivera produced one of the most violent knockouts of the past three years and was a candidate for 2009 "Knockout of the Year."

It's been nine years since Pitalua has won a fight by decision, and this video is further proof of why that's the case.

No. 5 Dmitry Pirog KO Daniel Jacobs (2010)

Undefeated Russian prospect Dimitry Pirog met undefeated up-and-comer Daniel Jacobs in a fight to determine the next best middleweight.

It was the co-main event of the rematch between Juan Diaz and Juan Manuel Marquez, and it stole the show.

Pirog landed a huge right hand that put Jacobs on the canvas. Before he could respond, the ref had already called off the bout.

No. 4 Saul Alvarez KO Carlos Baldomir

Carlos Baldomir had only been finished once in his extensive career that goes back to 1994. In fact, that was the last time he was finished before he met 20-year-old Saul "Canelo" Alvarez.

Alvarez put the iron-chinned opponent from Argentina on the canvas with a left hand. Even in a career fighting some of the very best, including Floyd Mayweather Jr, Arturo Gatti, Vernon Forrest and Zab Judah, Baldomir had never tasted the canvas like this.

It was an amazing knockout to boost the young Mexican fighters career into super-stardom.

No. 3 Fernando Montiel KO Nonito Donaire (2011)

The two pound-for-pound stars of the flyweight and bantamweight division met up in February of 2011 to determine who really deserved top 5 pound-for-pound recognition.

Nonito Donaire had been knocking everyone out and hadn't lost since 2001 in his second professional bout. Montiel had only lost two bouts by close decisions.

The matchup wasn't as even as expected after Donaire put Montiel down on the canvas with a left hook en route to a 2nd round KO.

No. 2 Manny Pacquiao KO Ricky Hatton

Supported by a HBO 24/7 four-part series and extreme buildup, Manny Pacquiao and Ricky Hatton were prepared to put on a show for boxing fans.

It ended quick and brutally after Pacquiao put Hatton on the floor three times in two rounds. The third was a savage left hand that left the fighter from England gasping for air on the canvas.

It was 2009's best knockout.

No. 1 Sergio Martinez KO Paul Williams (2010)

Their first fight had been a candidate for "Fight of the Year" in 2009. Could the rematch possibly live up to the hype?

Paul Williams had defeated Sergio Martinez by a controversial majority-decision in the first fight. Martinez had no plans of letting it go to the scorecards in the rematch, and he put Williams away with one of the most devastating one-punch knockouts in the history of boxing.