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Sergey Kovalev has had a total of four losses in his professional boxing career so far — all of them in title bouts. He suffered his first loss against Andre Ward via 12 round unanimous decision on November 19, 2016, which ended his 30-fight win streak. He has been stopped three times and lost once via decision.
Canelo Álvarez, Eleider Álvarez, and Andre Ward are the three boxers who have beaten Kovalev.
This is the first loss in Sergey Kovalev's career. Kovalev lost to American boxer Andre Ward via 12 round unanimous decision on . He was defending his light-heavyweight WBA (Super), IBF, and WBO titles, he was 33 years old with a record of 30-0-1. Ward was 32 years old with a record of 30-0.
On Kovalev lost to American boxer Andre Ward in the rematch via 8th round TKO. He and Ward were fighting for the vacant light-heavyweight The Ring title. He was 34 years old with a record of 30-1-1. Ward was 33 years old with a record of 31-0.
On Kovalev lost to Colombian boxer Eleider Álvarez via 7th round TKO. He was defending his light-heavyweight WBO title, he was 35 years old with a record of 32-2-1. Álvarez was 34 years old with a record of 23-0.
On Kovalev lost to Mexican boxer Canelo Álvarez via 11th round KO. He was defending his light-heavyweight WBO title, he was 36 years old with a record of 34-3-1. Canelo was 29 years old with a record of 52-1-2.