A day after being cleared to begin all baseball activity, Red Sox first baseman Mike Napoli (hip) participated in early fielding drills and later finished his day taking 50 ground balls at first base. Since he arrived at camp a week ago, his participation has been limited. He underwent a scheduled MRI on Thursday and was cleared on Saturday. “It feels good,” he said. “The first couple of days I was sitting around and was telling everybody, ‘Yeah, I want to play, too.’ It’s finally nice to get out there and be a part of everything and to be able to do everything.” Depending how he feels on a daily basis, Napoli will slowly progress this spring with the intention of being ready for the season opener on April 1 against the Yankees in New York.