Interest in free-agent relief pitcher David Robertson is picking up. At least half a dozen teams are showing interest in him. The Mets and Red Sox have been connected to him in recent days, but the Dodgers have also emerged as a suitor. Robertson went 8-3 with a 3.23 ERA and five saves in 69 games with the Yankees last year and has spent most of his career in the American League East, so the Red Sox would be a natural fit. He also lives in Rhode Island. [...]