On October 29, 2022, a 35-year-old Antonio Nieves (20-3-2, 11 KOs) and a 26-year-old Mexican boxer Alexandro Santiago (26-3-5, 13 KOs) met in the ring.
Nieves came in to the fight on a 1-fight win streak with a 44% KO rate, and was fighting after a gap of 1 year, 5 months, and 8 days. Santiago was on a 2-fight win streak with a 38% KO rate, and fighting after a layoff of 3 months.
In the rematch, Alexandro Santiago stopped Antonio Nieves via RTD in the 7th round. Santiago improves his record to 27-3-5 (14 KOs), while Nieves adds a loss to his record at 20-4-2.
On October 26, 2019, a 32-year-old Antonio Nieves (19-2-2, 11 KOs) and a 25-year-old Joshua Greer Jr. (20-1-1, 12 KOs) met in the ring in a bantamweight bout.
Nieves came in to the fight on a 2-fight win streak with a 47% KO rate, and was fighting after a gap of 4 months and 18 days. Greer Jr. was on a 17-fight win streak with a 54% KO rate, and fighting after a layoff of 3 months and 13 days.
Joshua Greer Jr. defeated Antonio Nieves via unanimous decision in the 10-round fight. Greer Jr. improves his record to 21-1-1, while Nieves adds a loss to his record at 19-3-2.
On September 9, 2017, a 30-year-old Antonio Nieves (17-1-2, 9 KOs) got a shot at the super-flyweight WBO title held by 24-year-old Japanese boxer Naoya Inoue (13-0, 11 KOs).
Nieves came in to the fight on a 1-fight losing streak with a 45% KO rate, and was fighting after a gap of 5 months and 30 days. Inoue was on a 13-fight win streak with a 84% KO rate, and fighting after a layoff of 3 months and 19 days.
The challenger refused to continue the fight in the 6th round, and Naoya Inoue is crowned the new super-flyweight world champion. Inoue improves his record to 14-0 (12 KOs), while Nieves adds a loss to his record at 17-2-2.
On March 10, 2017, a 29-year-old Antonio Nieves (17-0-2, 9 KOs) and a 27-year-old Russian boxer Nikolai Potapov (16-0-1, 8 KOs) met in the ring in a bantamweight bout.
Nieves came in to the fight on a 1-fight win streak with a 47% KO rate, and was fighting after a gap of 3 months and 12 days. Potapov was on a 2-fight win streak with a 47% KO rate, and fighting after a layoff of 2 months and 23 days.
Nikolai Potapov defeated Antonio Nieves via split decision in the 10-round fight. Potapov improves his record to 17-0-1, while Nieves adds a loss to his record at 17-1-2.