On April 29, 2001, 21-year-old Roberto Carlos Leyva (18-0, 17 KOs) and Daniel Reyes fought for the vacant IBF strawweight title.
Leyva came in to the fight on a 18-fight win streak with a 94% KO rate, and was fighting after a gap of 1 month and 6 days.
Roberto Carlos Leyva defeated Daniel Reyes via unanimous decision . Leyva improves his record to 19-0
On December 4, 2000, a 21-year-old Roberto Carlos Leyva (16-0, 15 KOs) and Víctor Burgos met in the ring in a light-flyweight bout.
Leyva came in to the fight on a 16-fight win streak with a 93% KO rate, and was fighting after a gap of 1 month and 1 day.
Roberto Carlos Leyva stopped Víctor Burgos via TKO in the 8th round. Leyva improves his record to 17-0 (16 KOs)
On July 31, 2004, a 24-year-old Roberto Carlos Leyva (23-3-1, 20 KOs) got a shot at the strawweight WBO title held by 29-year-old Puerto Rican boxer Iván Calderón (19-0, 4 KOs).
Leyva came in to the fight on a 1-fight win streak with a 74% KO rate, and was fighting after a gap of 1 month and 10 days. Calderón was on a 19-fight win streak with a 21% KO rate, and fighting after a layoff of 4 months and 11 days.
Iván Calderón defeated Roberto Carlos Leyva via unanimous decision and successfully defended his WBO strawweight title. Calderón improves his record to 20-0, while Leyva adds a loss to his record at 23-4-1.
On March 23, 2001, a 21-year-old Roberto Carlos Leyva (17-0, 16 KOs) and Martin Armenta met in the ring in a strawweight bout.
Leyva came in to the fight on a 17-fight win streak with a 94% KO rate, and was fighting after a gap of 3 months and 19 days.
Roberto Carlos Leyva stopped Martin Armenta via TKO in the 4th round. Leyva improves his record to 18-0 (17 KOs)
On June 2, 2000, a 20-year-old Roberto Carlos Leyva (13-0, 13 KOs) and Adel Gutierrez met in the ring in a strawweight bout.
Leyva came in to the fight on a 13-fight win streak with a 100% KO rate, and was fighting after a gap of 1 month and 26 days.
Roberto Carlos Leyva stopped Adel Gutierrez via TKO in the 4th round. Leyva improves his record to 14-0 (14 KOs)
On November 3, 2000, a 21-year-old Roberto Carlos Leyva (15-0, 14 KOs) and Luis Valdez met in the ring in a strawweight bout.
Leyva came in to the fight on a 15-fight win streak with a 93% KO rate, and was fighting after a gap of 2 months and 30 days.
Roberto Carlos Leyva stopped Luis Valdez via KO in the 4th round. Leyva improves his record to 16-0 (15 KOs)
On December 16, 1999, a 20-year-old Roberto Carlos Leyva (11-0, 11 KOs) and Lorenzo Trejo met in the ring.
Leyva came in to the fight on a 11-fight win streak with a 100% KO rate, and was fighting after a gap of 3 months and 7 days.
Roberto Carlos Leyva stopped Lorenzo Trejo via TKO in the 5th round. Leyva improves his record to 12-0 (12 KOs)
On August 9, 2002, Roberto Carlos Leyva and Miguel Barrera met again in a rematch.
Leyva came in to the fight on a 2-fight win streak with a 81% KO rate, and was fighting after a gap of 5 months.
Roberto Carlos Leyva was defending his strawweight IBF titles against Miguel Barrera and lost via unanimous decision in the 12-round strawweight fight, and adds an loss to his record at 21-1-1.
On October 16, 1998, an 18-year-old Roberto Carlos Leyva (5-0, 5 KOs) and Indalecio Valenzuela met in the ring.
Leyva came in to the fight on a 5-fight win streak with a 100% KO rate, and was fighting after a gap of 1 month.
Roberto Carlos Leyva stopped Indalecio Valenzuela via KO in the 1st round. Leyva improves his record to 6-0 (6 KOs)
On April 7, 2000, a 20-year-old Roberto Carlos Leyva (12-0, 12 KOs) and Aaron Sepulveda met in the ring.
Leyva came in to the fight on a 12-fight win streak with a 100% KO rate, and was fighting after a gap of 3 months and 22 days.
Roberto Carlos Leyva stopped Aaron Sepulveda via TKO in the 2nd round. Leyva improves his record to 13-0 (13 KOs)