I saw Sano on Saturday. He was 0-3 (a little sad I missed him by a day as he hit a homerun on Sunday). I'm no scout but I thought I'd share some of my thoughts. The ball does indeed jump off his bat. His first at bat, he hit a hard line drive right at the right fielder. His final at bat was a GIDP, but it was an absolute smash right at the shortstop. I'm not trying to exaggerate, but its just obvious that he hits the ball hard. The scouting report in the program says he has 'easy power' and I think that describes what I saw. I don't think that those who are concerned about the Twins ruining his power by telling him he needs to use all fields need to worry too much. He did not appear to be set on pulling the ball and it looks like he has natural power to all fields. Of his 11 hrs - 6 to left, 1 - left center, 1 - center, 3 right.
As for the concerns with him:
Defense: He committed an ugly error, which was by all accounts a footwork problem. He literally stepped on his own foot as he fielded the ball going to his left and then still tried to throw to first off-balance sailing it to the fence. I think he has pretty good hands to handle the infield. He definitely has the arm for third, but certainly needs to work on his footwork and approach to the ball.
Plate Discipline: He saw 16 pitches in his four plate appearances. He didn't chase anything out of the zone. He also swung at all but one strike that he saw (didn't swing and miss). In my opinion, none of the pitches that he swung at were pitchers pitches and seemed hittable strikes so I can't blame him for swinging. He drew a walk in his second plate appearance and popped-out on a first pitch strike in his next at-bat. I'm not really drawing any conclusion from the day about his plate discipline but just thought I'd share what I saw.