It is possible, if any of you trained every day you would know there are some days you just feel tired or off and nothing is working 100%, your heart isn't in it and you're just doing it because you have to. It so happens that for fighters sometimes those days line up with when they have to fight which will take away from their performance. It is odd that Joanna went undefeated so long and survived heavier hitters than Rose (Andrade landed heavier shots over 5 rounds in her previous fight) and then she gets KOed in round 1.. Joanna will likely show up better in the rematch, so don't count her out.