On January 28, 2023, a 34-year-old Ulises Sierra (17-2-2, 10 KOs) and a 26-year-old Uzbek boxer Bektemir Melikuziev (10-1, 8 KOs) met in the ring in a super-middleweight bout.
Sierra came in to the fight on a 2-fight win streak with a 47% KO rate, and was fighting after a gap of 1 year, 3 months, and 6 days. Melikuziev was on a 3-fight win streak with a 72% KO rate, and fighting after a layoff of 5 months and 22 days.
Bektemir Melikuziev stopped Ulises Sierra via KO in the 3rd round. Melikuziev improves his record to 11-1 (9 KOs), while Sierra adds a loss to his record at 17-3-2.
On December 12, 2020, a 31-year-old Ulises Sierra (15-1-2, 9 KOs) and a 23-year-old Edgar Berlanga (15-0, 15 KOs) met in the ring.
Sierra came in to the fight on a 1-fight losing streak with a 50% KO rate, and was fighting after a gap of 10 months and 25 days. Berlanga Jr. was on a 15-fight win streak with a 100% KO rate, and fighting after a layoff of 1 month and 25 days.
Edgar Berlanga Jr. stopped Ulises Sierra via TKO in the 1st round. Berlanga Jr. improves his record to 16-0 (16 KOs), while Sierra adds a loss to his record at 15-2-2.
On January 17, 2020, a 30-year-old Ulises Sierra (15-0-2, 9 KOs) and a 28-year-old Russian boxer Vladimir Shishkin (9-0, 6 KOs) met in the ring.
Sierra came in to the fight on a 8-fight win streak with a 52% KO rate, and was fighting after a gap of 8 months and 21 days. Shishkin was on a 9-fight win streak with a 66% KO rate, and fighting after a layoff of 4 months and 25 days.
Vladimir Shishkin defeated Ulises Sierra via unanimous decision in the 10-round fight. Shishkin improves his record to 10-0, while Sierra adds a loss to his record at 15-1-2.