Hip surgery limited Span to 61 games last year, but he did hit .302 with a league-leading 184 hits for the Washington Nationals in 2014. If healthy, he's a good fit in San Francisco. He'll bat leadoff and play center field, and the Giants can move the oft-injured Angel Pagan over to left field -- and allow Gregor Blanco to slide into the fourth outfielder role, which is where he belongs. With Hunter Pence in right field, San Francisco appears to be in good shape in the outfield.
Other teams, including the White Sox, Baltimore, Detroit, Texas and L.A. Angels, still could use some outfield help, and there remain plenty of useful players on the market.
Yoenis Cespedes and Justin Upton are the most attractive options for teams seeking an outfielder, but even with Span off the board, there are a few other decent second-tier guys available, including Dexter Fowler, Gerardo Parra and Austin Jackson.
According to a tweet from USA Today's Bob Nightengale, the Sox have not changed their stance on free-agent outfielders: They aren't willing to go beyond three years on a contract length for any of these guys. We have no way of knowing whether that's true, or just posturing, but it would be my speculation that the Sox aren't going to land Cespedes or Upton if they are unwilling to give at least a fourth year.