Final-round ratings for CBS' coverage of Mickelson's second green jacket victory Sunday were down 13 percent from last year, when Woods beat Chris DiMarco in a one-hole playoff to win his fourth Masters.
The overnight rating for Mickelson's win was a 9.0 with a 19 share, compared with a 10.3 with a 21 share for Woods' victory.
The ratings were up 23 percent from 2004, when Mickelson won his first Masters and CBS drew a 7.3 with an 18 share.
Overnight ratings measure the 55 largest TV markets in the United States, covering nearly 70 percent of the country. Each overnight rating point represents about 735,000 TV homes. The rating is the percentage of all homes with TVs, whether or not they are in use. The share is the percentage of in-use TVs tuned to a given show.