In the final round of the Summer Olympics, NBC continued to score ratings gold.

The Nielsen Co. says NBC won every night last week by a wide margin. An average of one-quarter of all televisions being watched in prime time were tuned to NBC.

And on Sunday the Olympics finished in fine style: The closing ceremony coverage was the week's most-watched show. It drew 31 million viewers.

The Olympics even lifted NBC to second place for the broadcast year in both total viewers and adults 18 to 49.

With Brian Williams anchoring from London, NBC's "Nightly News" continued to enjoy an Olympics boost of its own, averaging nearly 10 million viewers. ABC was second with 6.8 million, followed by the "CBS Evening News" with 5.4 million viewers.