Video: Ireland's Andy Lee produces devastating knockout to stun Madison Square Garden
Limerick's Andy Lee produced the punch of his career to knock John Jackson out after taking an early beating on the Cotto-Martinez undercard at Madison Square Garden in New York.
John Jackson dropped Lee with a massive right hook in the first round and continued to punish him in the second.
Lee kept Jackson at bay with a long, stiff jab in the third but Jackson was controlling the fight.
It looked like Jackson was about to finish lee off when the Irishman unloaded a massive hybrid hook-uppercut on the chin that knocked Jackson completely unconscious and prompted a wild rush into the ring from concerned medical staff and cornermen.
The fight was Lee’s first at Junior Middleweight and the win saw him crowned the NABF light middleweight champ.
In the main event of the night, Miguel Cotto claimed the World Boxing Council middleweight championship when title holder Sergio Martinez of Argentina did not answer the bell for the 10th round at Madison Square Garden.
Cotto, who used his ferocious left hook and punishing combinations to knock Martinez down three times in the first round, thoroughly dominated the scheduled 12-round bout, and Martinez's corner waved an end to the fight as the bell rang for round 10.
Martinez, who wore supportive sleeves on both his knees, was cut near his right eye and over his left eye and his knees buckled several times during the one-sided contest.
Cotto, 33, became the first Puerto Rican ever to win titles in four different weight divisions after previously holding the junior welterweight, welterweight and super welterweight crowns.
"This is the biggest achievement I ever had in my career," said Cotto.
Cotto improved to 39-4 while the 39-year-old Martinez fell to 51-3-2.