Dolphins to sign punter Fields for 4 more years

Miami Dolphins punter Brandon Fields has agreed to a four-year contract extension.

Agent Ian Greengross confirmed the deal Saturday. It is worth $13 million and includes $3.3 million in guaranteed money.

Fields' contract was set to expire after the 2012 season. The extension will put him under contract through 2016.

The 2007 seventh-round pick out of Michigan State is coming off his best NFL season. He set single-season franchise records with a 48.8-yard average and a net of 41.4 yards.

He was third in the NFL in punting average in 2011, behind only San Francisco's Andy Lee (50.9) and Oakland's Shane Lechler (50.8).

The only player on the Dolphins roster with a longer tenure is long snapper John Denney, who joined Miami as a rookie free agent in 2005.