On November 20, 2010, Sergio Martínez and Paul Williams met again in a rematch.
Martínez came in to the fight on a 1-fight win streak with a 49% KO rate, and was fighting after a gap of 7 months and 3 days. Williams was on a 6-fight win streak with a 67% KO rate, and fighting after a layoff of 6 months and 12 days.
Sergio Martínez made very easy work of Paul Williams in the rematch, stopping the challenger via KO in the 2nd. Martínez improves his record to 46-2-2 (25 KOs), while Williams adds a loss to his record at 39-2.
On September 15, 2012, 37-year-old Sergio Martínez (49-2-2, 28 KOs) and 26-year-old Julio César Chávez Jr. (46-0-1, 32 KOs) fought for the vacant middleweight title.
Martínez came in to the fight on a 5-fight win streak with a 52% KO rate, and was fighting after a gap of 5 months and 29 days. Chávez Jr. was on a 23-fight win streak with a 68% KO rate, and fighting after a layoff of 2 months and 30 days.
Sergio Martínez defeated Julio César Chávez Jr. via unanimous decision . Martínez improves his record to 50-2-2, while Chávez Jr. adds a loss to his record at 46-1-1.
On April 17, 2010, a 35-year-old Sergio Martínez (44-2-2, 24 KOs) got a shot at the WBC, WBO, and The Ring middleweight titles held by 28-year-old American boxer Kelly Pavlik (36-1, 32 KOs).
Martínez came in to the fight on a 1-fight losing streak with a 50% KO rate, and was fighting after a gap of 4 months and 12 days. Pavlik was on a 2-fight win streak with a 86% KO rate, and fighting after a layoff of 3 months and 29 days.
Sergio Martínez defeated Kelly Pavlik via unanimous decision and wins the WBC, WBO, and The Ring titles — in his first world-title fight. Martínez improves his record to 45-2-2, while Pavlik adds a loss to his record at 36-2.
On March 12, 2011, the 36-year-old The Ring middleweight world champion, Sergio Martínez (46-2-2, 25 KOs), faced Sergiy Dzinziruk, in a title defense fight.
Martínez came in to the fight on a 2-fight win streak with a 50% KO rate, and was fighting after a gap of 3 months and 20 days.
Sergio Martínez stopped Sergiy Dzinziruk via TKO in the 8th round of the 12-round world-title fight, and successfully defended his The Ring middleweight title. Martínez improves his record to 47-2-2 (26 KOs)
On October 1, 2011, the 36-year-old The Ring middleweight world champion, Sergio Martínez (47-2-2, 26 KOs), faced a 29-year-old British boxer Darren Barker (23-0, 14 KOs), in a title defense fight.
Martínez came in to the fight on a 3-fight win streak with a 51% KO rate, and was fighting after a gap of 6 months and 19 days. Barker was on a 23-fight win streak with a 60% KO rate, and fighting after a layoff of 5 months and 1 day.
Sergio Martínez stopped Darren Barker via KO in the 11th round of the 12-round world-title fight, and successfully defended his The Ring middleweight title. Martínez improves his record to 48-2-2 (27 KOs), while Barker adds a loss to his record at 23-1.
On April 27, 2013, the 38-year-old WBC and The Ring middleweight world champion, Sergio Martínez (50-2-2, 28 KOs), faced a 30-year-old British boxer Martin Murray (25-0-1, 11 KOs), in a title defense fight.
Martínez came in to the fight on a 6-fight win streak with a 51% KO rate, and was fighting after a gap of 7 months and 12 days. Murray was on a 2-fight win streak with a 42% KO rate, and fighting after a layoff of 5 months and 3 days.
Sergio Martínez defeated Martin Murray via unanimous decision and successfully defended his WBC and The Ring middleweight titles. Martínez improves his record to 51-2-2, while Murray adds a loss to his record at 25-1-1.
On March 17, 2012, the 37-year-old The Ring middleweight world champion, Sergio Martínez (48-2-2, 27 KOs), faced a 29-year-old British boxer Matthew Macklin (28-3, 19 KOs), in a title defense fight.
Martínez came in to the fight on a 4-fight win streak with a 51% KO rate, and was fighting after a gap of 5 months and 16 days. Macklin was on a -1-fight win streak with a 61% KO rate, and fighting after a layoff of 8 months and 21 days.
The challenger refused to continue the fight in the 11th round, and Sergio Martínez is crowned the new middleweight world champion. Martínez improves his record to 49-2-2 (28 KOs), while Macklin adds a loss to his record at 28-4.
On April 17, 2004, a 29-year-old Sergio Martínez (30-1-1, 12 KOs) and Richard Williams met in the ring for the 2nd time, in a super-welterweight bout.
Martínez came in to the fight on a 14-fight win streak with a 37% KO rate, and was fighting after a gap of 6 months and 8 days.
In the rematch, Sergio Martínez stopped Richard Williams via RTD in the 9th round. Martínez improves his record to 31-1-1 (13 KOs)
On June 21, 2003, a 28-year-old Sergio Martínez (28-1-1, 11 KOs) and Richard Williams met in the ring in a super-welterweight bout.
Martínez came in to the fight on a 12-fight win streak with a 36% KO rate, and was fighting after a gap of 1 month and 12 days.
Sergio Martínez defeated Richard Williams via unanimous decision in the 12-round super-welterweight fight. Martínez improves his record to 29-1-1
On October 4, 2008, a 33-year-old Sergio Martínez (43-1-1, 23 KOs) and Alex Bunema met in the ring in a super-welterweight bout.
Martínez came in to the fight on a 27-fight win streak with a 51% KO rate, and was fighting after a gap of 3 months and 27 days.
Sergio Martínez stopped Alex Bunema via RTD in the 8th round. Martínez improves his record to 44-1-1 (24 KOs)