Boxing: Segura KOs Calderon and the Five Biggest Upsets of 2010

The typical upset is defined as when one highly favored fighter is knocked out, outboxed, and/or outgunned in a match against someone not normally considered that fighter's equal in competition.

The following are the five biggest upsets of 2010 with video footage for each match so enjoy.

5. Chad Dawson Loses to Jean Pascal

Here are the video highlights of Chad Dawson Vs. Jean Pascal

Chad Dawson was an undefeated boxer who on Aug. 14, crossed the border to Canada to put his Light Heavyweight (175 lbs) Ring title on the line in the city of Montreal, Quebec against hometown hero Jean Pascal.

He started out extraordinarily slow and never built up any aggression against the continually forward-moving Jean Pascal.

Pascal won partly because of skill and partly because of Dawson having an off day. Many felt Dawson would have a competitive fight but no one expected Pascal to come away with the victory.

Dawson had previously had a series of four fights with older boxers Antonio Tarver and Glen Johnson.

He had not fought a boxer under forty in at least two years.

So, when a more lively opponent came forth and he accepted the challenge, he might not have known what he was getting himself into.

The fight was stopped by an accidental headbutt in round 11. The scorecards went as follows, 106-103 from two of the judges for Pascal. The last judge judge scored it 108-101 for Pascal.

Pascal fights next against 46-year-old Bernard Hopkins.

4. Jason Litzau Outpoints Celestino Caballero

Here are the highlights of Jason Litzau kicking the crap out of a tired Celestino Caballero.

Celestino Caballero was a feared opponent at the Super Bantamweight (122 pounds) level.

Caballero decided to challenge Jason Litzau at 130, thinking he could use him to show of how good he is and possibly land fights against rising stars Yuriorkis Gamboa and Juanma Lopez at 126 pounds.

Caballero did not take Litzau seriously. He was overweight in training and many had predicted Litzau just wasn't skilled enough. That was far from the truth.

Litzau had just enough tricks in the bag to nail Caballero and nearly send him to the canvas multiple times in the later rounds.

Caballero was knocking Litzau around the ring at first, but then his energy left the building but not his body which stayed around long enough to get pummeled by Litzau.

Jason Litzau proved Caballero was not ready for the upper weights and proved himself to be a potential contender with his split-decision victory over the once-feared Celestino Caballero.

3. Yonnhy Perez Loses in Rematch With Joseph Agbeko

This is a video of their first battle which Yonnhy Perez won.

Yonnhy Perez thoroughly beat Agbeko in October 2009 by way of unanimous decision.

Flash forward to Dec. 11 at the Showtime Bantamweight Tournament where they would have their rematch.

Perez, who was undefeated before the tournament, had previously fought undefeated fighter Abner Mares. Mares fought Perez to a draw.

Showtime then came up with the idea of a tournament and added Vic Darchinyan to fight Mares and Joseph Agbeko to rematch with Perez.

The idea was to have the two winners square off against each other in the finals next Spring.

Perez was favored to win his clash like Mares won his, so the two popular undefeated boxers could square off again. The 30-year-old Agbeko changed those plans with improved boxing skills and aggressive fighting that led to his upset victory.

Agbeko will face Mares next. As a consolation fight, Perez will face off against Darchinyan next.

2. Fernando Montiel Stops Hozumi Hasegawa In Round 4

Here's a video of Montiel's classic stoppage of Hasegawa.

This win was stunning and immediately entered Fernando Montiel into contention for fighter of the year.

When Hozumi Hasegawa was stopped in round four by big underdog Montiel, boxing critics and analysts went crazy trying to explain such a miraculous win.

Hasegawa initially got in some major counterpunches and Montiel's barrage of punches were missing.

This looked like just another victory for the Japanese warrior whose record stood at 28 wins with 12 coming by knockout and 2 losses coming by decision.

Then, Montiel began to connect and soon enough, the referee was forced to stop the fight.

This is the first knockout loss of Hasegawa's career and the best win in Montiel's.

Montiel is expected to face off against pound-for-pound superstar Nonito Donaire to defend his Bantamweight (118 lb) world title on Feb. 19, 2011.

1. Giovanni Segura Knocks Out Ivan Calderon

Here are the highlights from the epic matchup.

This was a sensational knockout.

Segura, a Mexican brawler, wasn't supposed to defeat the excellent boxer known as Ivan Calderon.

Some say the previously undefeated fighter's age finally caught up with him.

Others say Calderon,35, engaged in a brawl when he should have boxed. It was the wrong fight to prove he could be just as exciting as any brawler in boxing could be.

Whatever the excuse, Calderon was defeated by KO in round 8 after 34 straight victories and draw.

The two warriors will square off again on April 23 2011.