Mallorca finished the league in top 10 last season. They shouldn't be underestimated for sure. However... I can't say they have a good history against Barcelona.

If you look at their head-to-heads, they couldn't beat Barcelona for ages. Nearly in all of their games since then ended up with losses. This is why I see betting on Barcelona @1.39 quite sensible. I wish the odds were a little bit higher though.
The only problem could be stated like it is the beginning of the season and we don't know how the players will perform.
Even though Mallorca finished in the top 10 last season, I've always considered them to be very weak against a popular team like Barcelona. Mallorca would always lose against Barcelona, and the best result for Mallorca would be a highly unlikely draw. However, I wouldn't underestimate a team like Mallorca this early in the season and would bet on BTTS (Yes) to get more decent odds.
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