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Two years ago these two teams played the EC U18 qualifiers, Greece won 76-53 and 77-62. Then they played at the EC, Greece won 63-52, which makes 3-0 in head to head.
When we compare their rosters, we can see that Papagiannis is still at the Summer NBA with Sacramento, Charalampopulos, Anrerokoumpo and Lountiz are questionable, while Italy cannot count on their top player under 20, Moretti, nor on the trio that played the U19 final last night.
Let's go back 10 days, they played in Italy with similar rosters, Greece won 64-48, Papagiannis, Charalampopoulos and Lounzis have not played, not have the mentioned Italian players. Today they are playing in Greece, and the odds around 2.00 in the situation when they are facing a team against whom they have 4-0 makes no sense to me.
With the outcome on Greece, the 138.5 under has the same value, and I cannot see what could change for there to be 25 more points then 10 days ago, especially since the absent players are significant for their offense.
P.S. If it drops under 1.65, I would go for the under.