How often is he full of [censored]?

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It's the start of the tournament, so i dont know much if anyything.

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If this were UB, I can think of probably a dozen decent players who will make this move early in a tournament. If it were me against them, I'd probably think about calling around 1 in 3 times.

I agree with King Dan's point though, and in this case I think he has you. The cold call on the turn is telling.

So many players will play any pair from anywhere early. It's entire possible that he has made a baby set.

Some players will never let go of a 4-straight or 4-flush early either. Possibly he lucked out and straighted the river holding something like J9s.

Your turn bet "told" him that you have at least Tens. He called that and then bet into you. He is either very good or very lucky. Neither bodes well for you here, IMHO.

Curious to see the answer.