Whoever the announcer says won the first card, has lost. It's always Judge 1: For the loser Judge 2: For the winner Judge 3 For the winner. I can't remember the last time (if ever) it has been announced another way.
Interesting side question then, can anyone find examples where an SD wasn't called like this? I can't think of any
Ali / Norton was another exception. (both 1 and 2) Lamont Peterson / Amir Khan also. Kambosos / Lopez as well.