Giants shake up their roster and Tony Vitello is prepared to assert his authority

SAN FRANCISCO — On a typical afternoon before a game at the Giants’ waterfront ballpark, the two center-facing televisions in the home clubhouse show scouting video of the opposing pitcher. On Monday afternoon, the screens displayed something starkly different.Against a jarringly white and unchanging background, one message was intended for a run-starved position-player group that is distantly last in the majors in walks. The other message was for a pitching staff that hasn’t always controlled the strike zone.Team: SF OBP: .287 Rank: 30Team: SF BB/9: 3.9 Rank: 23Advertisement