3. Mike Aviles will be an offensive upgrade from Marco Scutaro. In his second year as the Red Sox' starting shortstop, Scutaro had a fine season in 2011 (.299 batting average, .781 OPS). When he was traded in January to Colorado for nondescript pitcher Clayton Mortensen, the deal left many Sox fans puzzled. But Aviles, 31, is a better player than he gets credit for -- as a rookie in 2008, he hit .325 with 10 homers for the Royals. He hit .317 after coming to the Red Sox last year, and he's a lifetime .288 hitter. If he stays healthy, he may be one of the season's big surprises.