The bettors are surely confident that Madrid will easily defeat Mallorca, which is not a strong team in La Liga. Previously, Mallorca had also been defeated by Barcelona. However, I don't expect Madrid to score a big margin in this match. So far, Madrid has only been able to score 3 goals against Real Oviedo. Therefore, it's likely to end 2-0.
This could be a pretty solid bet, but early season performance improvements are sometimes difficult to predict, so this bet could end up being problematic.
However, looking at the odds offered, I think it would make a lot of sense to put a few cents on this bet.
Currently, Madrid is in good form despite the criticism they received in the first week. By the second week, they truly answered the critics with the evidence they provided on the field.
Facing Mallorca with their solid defense could indeed be a problem, but when Xabi manages to bring a different dimension to their attacking scheme, it is likely that Madrid could score at least two goals in this week's match.