The Red Sox and Jonathan Papelbon came to an agreement on a one-year, $6.25 million deal today, so arbitration will not be necessary. The two sides could not come to an agreement on a long-term deal. Papelbon will not becaome eligible for free agency until after the 2011 season.
Theo Epstein still has a perfect record as far as never having any Red Sox player go to arbitration.
Here's more from ESPN.com.