On February 23, 1991, a 30-year-old Greg Haugen (27-3, 13 KOs) got a shot at the WBO super-lightweight title held by 28-year-old Puerto Rican boxer Hector Camacho (38-0, 16 KOs).
Haugen came in to the fight on a 2-fight win streak with a 43% KO rate, and was fighting after a gap of 2 months and 3 days. Camacho was on a 38-fight win streak with a 42% KO rate, and fighting after a layoff of 6 months and 12 days.
Greg Haugen defeated Hector Camacho via split decision and wins the WBO title. Haugen improves his record to 28-3, while Camacho adds a loss to his record at 38-1.
On February 6, 1988, Greg Haugen and Vinny Pazienza met again in a rematch.
Haugen came in to the fight on a 1-fight win streak with a 47% KO rate, and was fighting after a gap of 1 month and 21 days. Paz was on a 9-fight win streak with a 75% KO rate, and fighting after a layoff of 7 months and 30 days.
Greg Haugen defeated Vinny Pazienza via unanimous decision in the rematch and wins the IBF title. Haugen improves his record to 21-1, while Paz adds a loss to his record at 23-2.
On October 28, 1988, the 28-year-old IBF lightweight world champion, Greg Haugen (22-1, 10 KOs), faced Gert Bo Jacobsen, in a title defense fight.
Haugen came in to the fight on a 3-fight win streak with a 43% KO rate, and was fighting after a gap of 6 months and 17 days.
Greg Haugen stopped Gert Bo Jacobsen via TKO in the 10th round of the 12-round world-title fight, and successfully defended his IBF lightweight title. Haugen improves his record to 23-1 (11 KOs)
On December 5, 1986, a 26-year-old Greg Haugen (18-0, 9 KOs) got a shot at the IBF lightweight title held by Jimmy Paul.
Haugen came in to the fight on a 18-fight win streak with a 50% KO rate, and was fighting after a gap of 3 months and 16 days.
Greg Haugen defeated Jimmy Paul via majority decision and wins the IBF title — in his first world-title fight. Haugen improves his record to 19-0
On December 4, 1982, a 22-year-old Greg Haugen (1-0, 0 KOs) and Noel Arriesgado met in the ring for the 2nd time,.
Haugen came in to the fight on a 1-fight win streak with a 0% KO rate, and was fighting after a gap of 1 month.
In the rematch, Greg Haugen stopped Noel Arriesgado via KO in the 7th round. Haugen improves his record to 2-0 (1 KO)
On April 3, 1992, a 31-year-old Greg Haugen (29-4, 14 KOs) and a 31-year-old Ray Mancini (29-4, 23 KOs) met in the ring in a super-lightweight bout.
Haugen came in to the fight on a 1-fight win streak with a 42% KO rate, and was fighting after a gap of 5 months and 5 days. Mancini was on a -3-fight win streak with a 69% KO rate, and fighting after a layoff of 3 years and 28 days.
Greg Haugen stopped Ray Mancini via TKO in the 7th round. Haugen improves his record to 30-4 (15 KOs), while Mancini adds a loss to his record at 29-5.
On August 22, 1985, a 24-year-old Greg Haugen (11-0, 5 KOs) and a 25-year-old Freddie Roach (39-8, 14 KOs) met in the ring.
Haugen came in to the fight on a 11-fight win streak with a 45% KO rate, and was fighting after a gap of 1 month and 5 days. Roach was on a 3-fight win streak with a 29% KO rate, and fighting after a layoff of 1 month and 23 days.
Greg Haugen stopped Freddie Roach via TKO in the 7th round. Haugen improves his record to 12-0 (6 KOs), while Roach adds a loss to his record at 39-9.
On January 3, 1986, a 25-year-old Greg Haugen (13-0, 7 KOs) and Charlie Brown met in the ring.
Haugen came in to the fight on a 13-fight win streak with a 53% KO rate, and was fighting after a gap of 1 month and 28 days.
Greg Haugen stopped Charlie Brown via TKO in the 1st round. Haugen improves his record to 14-0 (8 KOs)
On November 20, 1998, a 38-year-old Greg Haugen (37-8-1, 19 KOs) and Paul Nave met in the ring for the 2nd time, in a welterweight bout.
Haugen came in to the fight on a 1-fight losing streak with a 41% KO rate, and was fighting after a gap of 7 months and 24 days.
In the rematch, Greg Haugen defeated Paul Nave via split decision in the 12-round welterweight fight. Haugen improves his record to 38-8-1
On February 18, 1989, the 28-year-old IBF lightweight world champion, Greg Haugen (23-1, 11 KOs), faced a 25-year-old Pernell Whitaker (16-1, 10 KOs), in a title defense fight.
Haugen came in to the fight on a 4-fight win streak with a 45% KO rate, and was fighting after a gap of 3 months and 21 days. Whitaker was on a 1-fight win streak with a 58% KO rate, and fighting after a layoff of 3 months and 16 days.
Pernell Whitaker defeated Greg Haugen via unanimous decision and wins the IBF title — in his first world-title fight. Whitaker improves his record to 17-1, while Haugen adds a loss to his record at 23-2.