Byron Buxton’s injury-plagued year continues.

The Twins’ top pick in the 2011 draft dislocated his left middle finger Monday while diving for a ball in the Arizona Fall League.

It is unclear how much time the outfielder will miss, but it’s another setback for a player considered to be the top prospect in baseball at the start of the year.

Buxton, 20, was limited to 31 minor league games this season because of a bruised left wrist during spring training — also suffered when he was diving for a ball — and a concussion suffered late in August in his first, and only, game at Class AA New Britain. Buxton had been scheduled to start the season at New Britain and, given the Twins’ outfield situation this year, could have been called up from the minors had he played well.

Now he is trying to salvage his year in Arizona, but he is batting only .263 for Salt River with five stolen bases. The injury occured in the ninth inning in a game against Mesa that ended in a 3-3 tie after 11 innings.