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Byasen don't have the quality that guaranteed them the position of an eternal vice-champion of the Norwegian championship. Now they belong in the middle of the league table. What's more important is that Byasen kept their extremely aggressive style, but their defense got worse this season. They're the second most efficient team, with 30 goals, and the leading team when it comes to conceded goals, 29.5 per match. We can expect them to use the same rhythm as in the championship, and use the lack of time Radnicki's players had to adjust.
Another factor to weigh in is a parallel between the match Byasen played against Podravka in the Champions League qualifiers, played in Kragujevac in September 2014. They tried to surprise Podravka with fast transition, and Miranda Tatari accepted it, helping Podravka score 18 out of 31 goal in the first part of the match, and the Norwegians got stuck with technical faults (over 20). That match ended up with 54 goals total. Tonight, I expect Byasen to be more successful with scoring, and at least 4-5 goals more in Radnicki's net.
Radnicki are similar to Podravka, but with more experienced and efficient wing players, and the right back Janjušević who is in a much better form than Živković was for Podravka. They're convincingly the most efficient team of the Serbian championship, and in the previous round of this cup, in the first match against the Romanian Cluj, they played an away match that ended with 58 goals total.
With conditions today, I see this match with at least 55.