Since when is odds 1.80ish bad? If he was a huge favorit, then it would be too much. But he is almost equal in odds against a worse and less experienced player than those he already beaten and himself. So I would say it's a pretty sweet odds at 1.70+
If Lajovic continues playing like he have been doing he should win. Sonegos playstyle is pretty simple, so nothing to surprise Lajovic here either.