no.
"Combo system" in EA UFC: you make several strikes in sequence by right timing (max 2 strikes to buffer because if you made 3 strikes to buffer then instead of 2nd strike will be 3rd strike animated) fast enough.
And IF your prev strike was landed (cear hit) then your follow up strike will be Faster and will have more Damage (dmg bonus) and so on.
You whiff your strike or it was blocked = combo multiplier become 0.