It was his second start this spring and his first appearance as the No. 3 hitter.
Polanco is batting .333 this spring and is tied with Pedro Alvarez, Andrew McCutchen and Chris McGuiness with a team-best five hits.
Pirates' general manager Neil Huntington has said several times that the prized outfield prospect will break camp with the major league club. Polanco's play is making that a difficult decision.
"He's doing some good things," Pirates' manager Clint Hurdle said. "The awareness has picked up (when) you hit a guy third. … (Porcello) hangs a breaking ball, and (Polanco) bangs it off the wall. He has a good path to the ball and focuses on the big part of the field."
Polanco is rated as the No. 10 overall prospect by Scout.com.
Pirates top prospect Gregory Polanco is off to a hot start in spring training. Polanco flashed his potential again on Tuesday from the No. 3 spot, drilling an RBI double to right that scored Jaff Decker in the third. Polanco also had an infield single in the first and finished 2 for 3. The two hits came off Detroit Tigers starter Rick Porecello.
OF is red hot in spring training.