Ron Washington won’t be a lame-duck manager this season.

The Texas Rangers and Washington agreed to a contract extension through the 2015 season, general manager Jon Daniels announced on Monday.

“I thought this was a foregone conclusion, this guy has been our leader through a lot of tremendous times,” Daniels said. “You’re talking about a tenured veteran guy who this team believes in and followed in some big-time battles. Lame-duck? I don’t really buy into that. That wasn’t really our thought process.”

Washington, 61, is going into his eighth season with the Rangers. He’s the winningest manager in franchise history, and has taken the team to its greatest heights by going to the World Series in 2010 and 2011. The Rangers have won at least 90 games the past four seasons under Washington, as he joins Tampa Bay’s Joe Maddon as the only other manager to accomplish that feat.

Washington has a career managing record of 611-524, all with the Rangers. The 611 wins since the 2007 season rank as the fourth-most by a manager.