Mary Spencer vs. Mikaela Mayer will go down later this evening (Oct.30) at the Casino Montreal in Quebec, Canada, with the WBA, WBO, and WBC women's super-welterweight titles on the line.Spencer (10-2) is undefeated ever since her failed title bid against Femke Hermans in 2023. Currently on a three-fight win streak, the reigning WBA title holder was last seen winning a unanimous decision over Ogleidis Suarez in April.Mayer (21-2) is coming to Quebec riding a two-fight win streak, with back-to-back wins over former WBO world welterweight champion Sandy Ryan.According to Odds Checker, Spencer is a +550 underdog for the matchup with Mayer as a -550 favorite. The main card of the event is now underway. Stick with Sportskeeda for live coverage and round-by-round updates from the fight card.Check out Mary Spencer and Mikaela Mayer face-off ahead of their unified world championship bout below: View this post on Instagram Instagram PostMary Spencer vs. Mikaela Mayer Round 1Both fighters let loose their jab to gauge reach and distance. Mayer looks a bit more fluid on her feet as she does to the body and up top with blistering speed. Spencer is using jabs to try and keep her opponent on the outside.Mayer is landing. A big left hook from the American momentarily stuns her opponent.Our score: 10-9 Mayer, Mayer 10-9 overall.Round 2Mayer stings her opponent's midsection with back-to-back power jabs. A powerful body shot lands for Specner. Mayer returns fire with a quick 1-2 followed by a body shot.Mayer is leading the dance, with her larger opponent seemingly looking to lure her into a counter.Our score: 10-9 Mayer, Mayer 20-18 overall.Round 3The fighter trade bombs near the ropes. A good left hook on the inside lands for Spencer. She follows it up with a chopping right hand. A quick jab from Mayer pops her opponent's head back. She connects with a powerful left hook. Another round of relentless pressure from Mayer.Our score: 10-9 Mayer, Mayer 30-27 overall.Round 4Spencer unloads a barrage as her opponent tries to close the distance. Mayer's is going punch-for-punch with her opponent, landing the cleaner shots of the two. The 35-year-old is fighting efficiently on the inside, pushing back her much larger opponent with relative ease.Our score: 10-9 Mayer, Mayer 40-36 overallRound 5Mayer comes out guns blazing, pushes Spencer onto the ropes. The Canaida quickly pivots out of the corner, but is quickly forced to go on the back foot. Spencer connects with a quick 1-2. She follows it up with an upper cut.During the dying seconds of the round, the champ sneaks in another uppercut. A great round for Spencer.Our score: 10-9 Spencer, Mayer 49-46 overallRound 6Mayer starts the round strong, landing both to her opponent's body and head. The American seems to have taken charge of the round and swarms her opponents with a relentless combination.Our score: 10-9 Mayer, Mayer 59-55 overallRound 7Mayer is still in control and is effortlessly pushing her opponent back with quick jabs and straight right hands. Spencer comes back with a good left look and an uppercut.While Spencer is landing good shots, Mayer's volume assault seems to be running away with the fight.Our score: 10-9 Mayer, Mayer 69-64 overallRound 8Mayer's barrage is stopped momentarily as she is stunned by a right hand. However, Mayer's volume punches are giving her opponent few chances to un cork her straight punches.Our score: 10-9 Spencer, Mayer 78-74 overallRound 9Spencer tries to halt her opponent's offense with body shots. Mayer's volume punching, however, is still controlling the round.Our score: 10-9 Mayer, Mayer 88-83 overallRound 10Official decision: Mikaela Mayer def. Mary Spencer via unanimous decision.