Database: professional_basketball
Question: Which player selected by Portland in 2nd draftRound won Rookie of the Year in 1971?
SQL: SELECT T1.playerID FROM draft AS T1 INNER JOIN awards_players AS T2 ON T1.playerID = T2.playerID WHERE T2.award = 'Rookie of the Year' AND T1.draftYear = 1971 AND T1.draftRound = 2