They were once co-hosts, now they are pitted against each other...well for the week, anyway! Matt Lauer, host of NBC's top-rated TODAY SHOW, and Katie Couric filling-in for Robin Roberts on 'the steadily rising' Good Morning America.

Determined to overtake NBC's Today in the morning race, ABC installed NBC's former host, Katie Couric, as Good Morning America's guest host for the week for the vacationing Roberts.

NBC countered with bringing back Meredith Viera for a day, and Sarah Palin...but our question involves a match-up against the big guns.