On January 30, 2020, a 27-year-old Joseph Diaz (30-1, 15 KOs) got a shot at the IBF super-featherweight title held by 29-year-old Tevin Farmer (30-4-1, 6 KOs).
Diaz came in to the fight on a 4-fight win streak with a 48% KO rate, and was fighting after a gap of 4 months and 9 days. Farmer was on a 23-fight win streak with a 17% KO rate, and fighting after a layoff of 6 months and 3 days.
Joseph Diaz defeated Tevin Farmer via unanimous decision and wins the IBF title — in his first world-title fight. Diaz improves his record to 31-1, while Farmer adds a loss to his record at 30-5-1.
On July 9, 2021, a 28-year-old Joseph Diaz (31-1-1, 15 KOs) and a 31-year-old Dominican boxer Javier Fortuna (36-2-1, 25 KOs) met in the ring in a lightweight bout.
Diaz came in to the fight after a draw in his last fight with a 45% KO rate, and was fighting after a gap of 4 months and 26 days. Fortuna was on a 3-fight win streak with a 64% KO rate, and fighting after a layoff of 7 months and 18 days.
Joseph Diaz defeated Javier Fortuna via unanimous decision in the 12-round lightweight fight. Diaz improves his record to 32-1-1, while Fortuna adds a loss to his record at 36-3-1.
On February 22, 2018, a 25-year-old Joseph Diaz (25-0, 13 KOs) and Victor Terrazas met in the ring in a featherweight bout.
Diaz came in to the fight on a 25-fight win streak with a 52% KO rate, and was fighting after a gap of 5 months and 6 days.
Joseph Diaz stopped Victor Terrazas via KO in the 3rd round. Diaz improves his record to 26-0 (14 KOs)
On December 4, 2021, a 29-year-old Joseph Diaz (32-1-1, 15 KOs) got a shot at the lightweight WBC title held by 23-year-old Devin Haney (26-0, 15 KOs).
Diaz came in to the fight on a 1-fight win streak with a 44% KO rate, and was fighting after a gap of 4 months and 25 days. Haney was on a 26-fight win streak with a 57% KO rate, and fighting after a layoff of 6 months and 5 days.
Devin Haney defeated Joseph Diaz via unanimous decision and successfully defended his WBC lightweight title. Haney improves his record to 27-0, while Diaz adds a loss to his record at 32-2-1.
On May 19, 2018, a 25-year-old Joseph Diaz (26-0, 14 KOs) got a shot at the featherweight WBC title held by 29-year-old Gary Russell Jr. (28-1, 17 KOs).
Diaz came in to the fight on a 26-fight win streak with a 53% KO rate, and was fighting after a gap of 2 months and 27 days. Russell Jr. was on a 4-fight win streak with a 58% KO rate, and fighting after a layoff of 11 months and 29 days.
Gary Russell Jr. defeated Joseph Diaz via unanimous decision and successfully defended his WBC featherweight title. Russell Jr. improves his record to 29-1, while Diaz adds a loss to his record at 26-1.
On September 17, 2016, a 23-year-old Joseph Diaz (21-0, 12 KOs) and Andrew Cancio met in the ring in a featherweight bout.
Diaz came in to the fight on a 21-fight win streak with a 57% KO rate, and was fighting after a gap of 1 month and 18 days.
Joseph Diaz stopped Andrew Cancio via TKO in the 9th round. Diaz improves his record to 22-0 (13 KOs)
On December 18, 2015, a 23-year-old Joseph Diaz (18-0, 10 KOs) and Hugo Partida met in the ring in a featherweight bout.
Diaz came in to the fight on a 18-fight win streak with a 55% KO rate, and was fighting after a gap of 1 month and 25 days.
Joseph Diaz stopped Hugo Partida via TKO in the 2nd round. Diaz improves his record to 19-0 (11 KOs)
On July 30, 2016, a 23-year-old Joseph Diaz (20-0, 11 KOs) and Victor Proa met in the ring in a featherweight bout.
Diaz came in to the fight on a 20-fight win streak with a 55% KO rate, and was fighting after a gap of 3 months and 7 days.
Joseph Diaz stopped Victor Proa via KO in the 2nd round. Diaz improves his record to 21-0 (12 KOs)
On May 6, 2017, a 24-year-old Joseph Diaz (23-0, 13 KOs) and Manuel Ávila met in the ring in a featherweight bout.
Diaz came in to the fight on a 23-fight win streak with a 56% KO rate, and was fighting after a gap of 4 months and 19 days.
Joseph Diaz defeated Manuel Ávila via unanimous decision in the 10-round featherweight fight. Diaz improves his record to 24-0
On December 17, 2016, a 24-year-old Joseph Diaz (22-0, 13 KOs) and Horacio García met in the ring in a featherweight bout.
Diaz came in to the fight on a 22-fight win streak with a 59% KO rate, and was fighting after a gap of 3 months.
Joseph Diaz defeated Horacio García via unanimous decision in the 10-round featherweight fight. Diaz improves his record to 23-0