NCAA tournament's 1st full day earns highest preliminary television rating in 22 years

The NCAA tournament's first full day has earned its highest preliminary television rating in 22 years.

The games Thursday on CBS, TBS, TNT and truTV averaged a 5.8 overnight rating and 14 share. The networks say that was up 4 percent from 2012.

This is the third season of CBS and Turner's 14-year, $10.8 billion contract to televise every game of the tournament in its entirety, a change in approach that so far has been a ratings success.

Ratings represent the percentage of all homes with televisions tuned to a program. Shares represent the percentage of all homes with TVs in use at the time. Overnight ratings measure the country's largest markets.