Well, I can't speak for others, but often my first prediction doesn't mean much. Sometimes I go with my gut reaction, sometimes I just put down what I'd like to see... then closer to the match I actually look at the stats, think about it more closely, think about what I've read in the stats and discussion topic, and make a real prediction. So that's why sometimes I make huge changes in my predictions.
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....TCELES B HSUP