Apparently Matt Mitrione fell ill hours before the fight and it was cancelled...I would be pissed if I bought a ticket for that!
http://www.mmafighting.com/2017/2/18/14659820/fedor-emelianenko-vs-matt-mitrione-canceled-just-hours-before-bellator-172
http://www.mmafighting.com/2017/2/18/14659820/fedor-emelianenko-vs-matt-mitrione-canceled-just-hours-before-bellator-172