From Ron Sirak's blog post on the Masters moving to ESPN:
The move also makes sense for USA Network, which at one time had Thursday-Friday coverage of the PGA Tour but is now out of golf, except for the Masters. In 2007, USA Network was live from 4-7 p.m. on Thursday and Friday, with replays from 8-11 both days. CBS did the live weekend coverage from 3:30-7 on Saturday and 2:30-7 on Sunday. One source said the prime-time replays on USA Network hurt its evening ratings and that while the Masters is a prestigious event, it was not worth the price tag needed to secure it.