Rapid Reaction: K-Mart is coming back

The Knicks' final major free-agent domino has fallen.

Kenyon Martin reached an agreement with New York on Wednesday afternoon, agent Andy Miller said.

The Knicks now have eight rotation players back from last season's roster.

Mike Woodson may have his hands full trying to define roles for all those players along with newcomers Metta World Peace and Andrea Bargnani.

But Martin's role is to be well-defined: protect the paint, defend the rim and rebound.

WHAT CAN KENYON BRING: Martin, a 13-year veteran, averaged 7.2 points and 5.3 rebounds in 18 regular-season games.

He was a key cog during the Knicks' 13-game winning streak late in the regular season. Martin also played a pivotal role for New York in the playoffs.

His ability to rebound and defend on the inside "changed the Knicks' season," according to Jason Kidd.

The hope for New York is that Martin can do the same this season.

It's fair to wonder, though, if the 35-year-old Martin can handle the pounding of an 82-game season at this point in his career.

Outside of Martin, Tyson Chandler and World Peace, the Knicks don't have many players who can defend the paint. Depending on their remaining signings, Martin's health could be crucial for the Knicks in 2013-14.

WHOM DOES HIS SIGNING AFFECT? The Knicks will still be in the market for a center to backup Chandler and a third point guard to play behind Raymond Felton and Pablo Prigioni. Martin's signing doesn't change that.

His presence could affect Bargnani and Amar'e Stoudemire though. If Bargnani, Stoudemire and Martin are all coming off the bench, they may be fighting for some of the same minutes if the Knicks ink a backup center they trust.

WHAT'S NEXT: The Knicks now have three open roster spots. General manager Glen Grunwald has said he may keep one or two roster spots open heading into training camp so the team has room to sign a training-camp invitee. The Knicks have shown interest in reserve guards Bobby Brown and Toure' Murry, who played for the team in summer league. They were also impressed by summer league participant Jeremy Tyler, a 6-foot-10 F/C.

You can follow Ian Begley on Twitter.