Spain striker Diego Costa is used to bullying defences with his physical style, but Slovakia's Martin Skrtel let the Chelsea star know that he is willing to give as good as he is getting during Thursday evening's Euro 2016 qualifier.
In the opening minutes, Skrtel let his presence be known by apparently kicking Costa's troublesome hamstring.
Moments later, the Premier League top scorer gave his opposite number a fairly unfriendly shoulder barge from behind as a means of reciprocation.
They're probably not on each other's Christmas card lists.
The running battle continued through the game as they players appeared to exchange verbal fisticuffs...