Answer
Sergey Kovalev has won the WBO title on three separate occasions. He first held the title from 2013 to 2016, when he was defeated by Andre Ward. He then regained the title in 2017, and held it until 2018, when he lost to Eleider Álvarez. Kovalev once again won the title in 2019, and held it until 2021, when he was defeated by Canelo Álvarez.