turns 22 next month.
Polanco started at shortstop, got a hit, drew a walk, hit another ball hard and had ... adventures in the field. Some nice plays, some misplays. He was charged with one error and was at least tangentially involved in two others. (At least one beat writer, Mike Berardino, suggested on Twitter that Torii Hunter's flip to nowhere was because Polanco wasn't where he was supposed to be, and the Joe Mauer throwing error had Polanco as its target.)
I saw Polanco play a game at short two years ago in Cedar Rapids, and my immediate impression at the time was that his throwing arm is a bit weak for the position. I expect shortstops to show me throws to first that sizzle. Now, there have been outstanding shortstops who didn't have that kind of arm -- Ozzie Smith after his shoulder injury, for example. So its possible for Polanco to be a major league shortstop without a Cal Ripken cannon. But he can't be the human pinball bumper he resembled at times Wednesday.
My take on Polanco: As a hitter, he's major-league ready. I believe in his bat. I think he's best off at second base. The Twins have Brian Dozier at second, and while I can make a case for ranking Polanco ahead of Dozier, it's largely age based (Polanco is about six years younger). Dozier has more power, and he's established himself as a quality second baseman.
If it weren't for the shortstop vacancy, I would expect the Twins to auction off one of them, most likely Polanco. But there's no urgency.