Cable's top-rated summer series has seen ratings climb 5 percent this season in the 18-to-49 demo.
TNT says "The Closer's" second-season debut on June 12 posted the "largest audience delivery ever for an original scripted series" on ad-supported cable.
"Once again, 'The Closer' has proven to be one of television's biggest success stories of the summer," said Steve Koonin, executive vice president-COO for TNT and TBS--"proving itself to be a sustainable hit with lasting appeal."