"The last Emperor!
Thank you for everything, brother!” Alexander wrote in his Telegram channel.
Emelianenko had a farewell fight with Bader as part of the Bellator tournament, where he lost to the fighter by knockout in the first round.
On account of the 46-year-old Emelianenko, 40 wins and seven losses, one more fight was declared invalid.
Bader, 39, has 31 wins and seven losses.
Earlier, Bellator President Scott Cocker opined that Emelianenko has earned the right to be considered the greatest mixed martial artist (MMA) of all time.