SAN FRANCISCO Forward Andrew Wiggins has reached agreement with the Golden State Warriors on four-year contract extension, a person with direct knowledge of the deal said Saturday. The person spoke on condition of anonymity because the team had yet to make a formal announcement. A first-time All-Star last season, the 27-year-old Wiggins reached the playoffs for just the second time in his eight-year career and often took on a tough defensive assignment in helping the Warriors capture their fourth championship in eight seasons.