Smith, who grew up in Danvers and attended Governor’s Academy, has turned into a pleasant surprise for the last-place White Sox after he was selected by the team in the Rule 5 draft. The White Sox also have Mike Vasil, another 25-year-old Rule 5 right-hander from Wellesley and BC Highwho was claimed off waivers from the Rays in March. The Rule 5 draft provides an opportunity for players left off big league team’s 40-man rosters after several minor league seasons. Between 10 and 20 players are selected in the big league Rule 5 draft most seasons, but most don’t actually stick with their new clubs.