The 5.6 overnight rating with a 13 share for the final round was down from the 9.3/21 for last year's final round at Bethpage Black, where Woods held off Phil Mickelson to win the second of golf's four majors by three shots.
Last year's ratings were the highest for the U.S. Open since Nielsen Media Research began tracking overnights in 1975.
NBC's telecast of Sunday's final round ran from 1:30-8 p.m. Jim Furyk won his first major by three shots over Stephen Leaney.
Saturday's third-round coverage generated a 5.3 overnight rating and a 13 share -- 17 percent lower than last year's 6.4/16.
The final round in 2001, in which Retief Goosen won in a playoff, drew a 7.0/17, while Woods' win at Pebble Beach in 2000 received a then-record 8.8/21.
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