July 13, 2010 at 07:07 PM EDT

Image Credit: Eric Ogden/TNTMore than 7 million viewers tuned into the debut of TNT’s Rizzoli & Isles Monday – the most-watched premiere ever for an ad-supported cable show, the network announced. The drama that stars Angie Harmon and Sasha Alexander bowed after the sixth season premiere of The Closer, which averaged 7.7 million viewers (up 7% over last year). Rizzoli & Isles – which is based on the crime novels by author Tess Garritsen – lured 7.55 million viewers. It also built on its lead-in from The Closer among adults 18-49 and adults 25-54.

Harmon plays detective Jane Rizzoli and Alexander plays medical examiner Maura Isles – two friends who solve crimes together in Boston. The show also stars Lorraine Bracco (The Sopranos).

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