On October 19, 2017, a 34-year-old Sydney LeBlanc (4-4-1, 0 KOs) and Kali Reis met in the ring.
LeBlanc came in to the fight on a 4-fight losing streak with a 0% KO rate, and was fighting after a gap of 1 month and 23 days.
Sydney LeBlanc lost to Kali Reis via unanimous decision in the 6-round fight, and adds a loss to his record at 4-5-1.
On August 26, 2017, a 33-year-old Sydney LeBlanc (4-3-1, 0 KOs) and Savannah Marshall met in the ring.
LeBlanc came in to the fight on a 3-fight losing streak with a 0% KO rate, and was fighting after a gap of 14 days.
Sydney LeBlanc lost to Savannah Marshall via unanimous decision in the 4-round fight, and adds a loss to his record at 4-4-1.
On August 12, 2017, a 33-year-old Sydney LeBlanc (4-2-1, 0 KOs) and Franchón Crews-Dezurn met in the ring.
LeBlanc came in to the fight on a 2-fight losing streak with a 0% KO rate, and was fighting after a gap of 1 month and 27 days.
Sydney LeBlanc lost to Franchón Crews-Dezurn via unanimous decision in the 4-round fight, and adds a loss to his record at 4-3-1.
On June 16, 2017, a 33-year-old Sydney LeBlanc (4-1-1, 0 KOs) and Claressa Shields met in the ring in a super-middleweight bout.
LeBlanc came in to the fight on a 1-fight losing streak with a 0% KO rate, and was fighting after a gap of 2 months and 7 days.
Sydney LeBlanc lost to Claressa Shields via unanimous decision in the 8-round super-middleweight fight, and adds a loss to his record at 4-2-1.
On April 9, 2017, a 33-year-old Sydney LeBlanc (4-0-1, 0 KOs) and Maricela Cornejo met in the ring.
LeBlanc came in to the fight on a 4-fight win streak with a 0% KO rate, and was fighting after a gap of 3 years, 6 months, and 6 days.
Sydney LeBlanc lost to Maricela Cornejo via unanimous decision in the 6-round fight, and adds a loss to his record at 4-1-1.