In bizarre circumstances both men landed punches and elbowed each other whilst continuing to ride as they made up a breakaway group of 13 riders.
Rovny (Tinkoff-Saxo) even had to ask for a new pair of sunglasses from his Tinkoff-Saxo team car as they were broken in the bust up.
It was originally announced that tour organisers would take a decision on sanctions at the end of the stage, but with Brambilla (Omega Pharma-QuickStep) still part of a lead group of three with just 15 kilometres to go both teams were instructed to tell their riders to stop as they had been disqualified.
Should Brambilla and Rovny have been disqualified? Tell us what you think.