Casey Kotchman, Mariners meet in the middle, agree to one-year, $3,517,500 contract.

The Mariners signed their last arbitration-eligible player Wednesday when first baseman Casey Kotchman agreed to a one-year, $3,517,500 contract.

The salary represents a compromise at the precise midpoint between the arbitration filings of each side — Kotchman’s $3.9 million request and the Mariners’ $3,135,000 offer.

Kotchman, 26, earned $2,885,000 last year, when he split the season between Atlanta and Boston. In 126 combined games, he hit .268 with seven homers and 48 runs batted in.

The Mariners haven’t had an arbitration case since pitcher Freddy Garcia before the 2003 season.

They began the winter with six arbitration-eligible players, but reached one-year deals with Mark Lowe, David Aardsma, Brandon League and Kotchman, and long-term contracts with Felix Hernandez and Franklin Gutierrez.

The Mariners also announced that first baseman Tommy Everidge has been outrighted to Class AAA Tacoma. Everidge had been designated for assignment on Friday to make room on the 40-man roster for newly signed free agent Eric Byrnes.

Everidge will be invited to major-league camp for spring training.

Larry Stone: 206-464-3146 or lstone@seattletimes.com