The ITV breakfast show, now fronted by Lorraine Kelly and Aled Jones with a new look and logo, held a 17% share between 6am and 8am.
Some 1.43m (35.7%) watched BBC Breakfast on the other side from 6am until 9.15am.
Daybreak's figures are around 100k down compared to the first Monday last year, and nearly 400k short of the programme's launch in 2010.
Compared to last Friday however, the show has increased 100,000 and three share points.
Regarding yesterday's revamp, an ITV spokesperson told Digital Spy: "We were very pleased with how the the first day of the new Daybreak went yesterday, and we look forward to building on this with more from Ranvir and Matt, and Lorraine and Aled."
ITV's director of television Peter Fincham said last week that he wasn't expecting success to "happen overnight".
Adrian Chiles and Christine Bleakley, Daybreak's original hosts, presented their final edition on December 5, 2011.
Dan Lobb and Kate Garraway filled in as hosts between Chiles and Bleakley's departure and yesterday's relaunch.
BARB ratings data supplied by Attentional