On March 17, 2024, a 39-year-old Gary O'Sullivan (31-5, 21 KOs) and Sofiane Khati met in the ring in a middleweight bout.
O'Sullivan came in to the fight on a 1-fight losing streak with a 58% KO rate, and was fighting after a gap of 1 year, 9 months, and 18 days.
Gary O'Sullivan lost to Sofiane Khati via points decision in the 8-round middleweight fight, and adds an loss to his record at 31-6.
On May 28, 2022, a 37-year-old Gary O'Sullivan (31-4, 21 KOs) got a shot at the middleweight WBA (Regular) title held by 39-year-old American boxer Erislandy Lara (28-3-3, 16 KOs).
O'Sullivan came in to the fight on a 1-fight win streak with a 60% KO rate, and was fighting after a gap of 11 months and 29 days. Lara was on a 3-fight win streak with a 47% KO rate, and fighting after a layoff of 1 year and 27 days.
Erislandy Lara stopped Gary O'Sullivan via TKO in the 8th round of the 12-round world-title fight, and successfully defended his WBA (Regular) middleweight title. Lara improves his record to 29-3-3 (17 KOs), while O'Sullivan adds a loss to his record at 31-5.
On January 11, 2020, a 35-year-old Gary O'Sullivan (30-3, 21 KOs) and a 23-year-old Mexican boxer Jaime Munguia (34-0, 27 KOs) met in the ring.
O'Sullivan came in to the fight on a 2-fight win streak with a 63% KO rate, and was fighting after a gap of 9 months and 26 days. Munguía was on a 34-fight win streak with a 79% KO rate, and fighting after a layoff of 3 months and 28 days.
Jaime Munguía stopped Gary O'Sullivan via TKO in the 11th round. Munguía improves his record to 35-0 (28 KOs), while O'Sullivan adds a loss to his record at 30-4.
On September 15, 2018, a 34-year-old Gary O'Sullivan (28-2, 20 KOs) and a 29-year-old Canadian boxer David Lemieux (39-4, 33 KOs) met in the ring.
O'Sullivan came in to the fight on a 6-fight win streak with a 66% KO rate, and was fighting after a gap of 4 months and 11 days. Lemieux was on a 1-fight win streak with a 76% KO rate, and fighting after a layoff of 3 months and 20 days.
David Lemieux stopped Gary O'Sullivan via KO in the 1st round. Lemieux improves his record to 40-4 (34 KOs), while O'Sullivan adds a loss to his record at 28-3.
On December 12, 2015, a 31-year-old Gary O'Sullivan (22-1, 15 KOs) and a 26-year-old British boxer Chris Eubank Jr. (20-1, 15 KOs) met in the ring.
O'Sullivan came in to the fight on a 6-fight win streak with a 65% KO rate, and was fighting after a gap of 2 months and 2 days. Eubank Jr. was on a 2-fight win streak with a 71% KO rate, and fighting after a layoff of 1 month and 18 days.
Chris Eubank Jr. stopped Gary O'Sullivan via RTD in the 7th round. Eubank Jr. improves his record to 21-1 (16 KOs), while O'Sullivan adds a loss to his record at 22-2.
On July 20, 2013, a 29-year-old Gary O'Sullivan (16-0, 10 KOs) and a 23-year-old British boxer Billy Joe Saunders (17-0, 10 KOs) met in the ring in a middleweight bout.
O'Sullivan came in to the fight on a 16-fight win streak with a 62% KO rate, and was fighting after a gap of 2 months and 17 days. Saunders was on a 17-fight win streak with a 58% KO rate, and fighting after a layoff of 3 months and 29 days.
Billy Joe Saunders defeated Gary O'Sullivan via unanimous decision in the 12-round middleweight fight. Saunders improves his record to 18-0, while O'Sullivan adds a loss to his record at 16-1.