Red Sox reliever Durbin Feltman was expected to travel an unusually fast track through the Red Sox minor league system. To this point, he’s staying on script. The Red Sox moved Feltman, 21, up to High A Salem on Wednesday. He is the first Red Sox draftee to move above Single A Greenville in his draft summer in years, possibly dating to when 2005 first-rounder Craig Hansen reached the big leagues in his pro debut. The Red Sox selected Feltman in the third round (100th overall) of June’s draft. In 11 minor league appearances of one inning each — four innings with short-season Lowell and seven innings with Single A Greenville — Feltman largely has overwhelmed his competition. Of the 42 batters he has faced, he has struck out half while holding them to a .146/.167/.244 line on the strength of a powerful mid- to high-90s fastball and a wipeout mid-80s slider. Close The biggest headlines, delivered to your inbox Get news as it happens. Sign up for Boston.com’s email news alerts. Thanks for signing up!