Doomsday would smash Black Adam to pieces... I really don't know if BA could overwhelm DD with speed because Doomsday is pretty fast in his own right. So this would be a slugfest and I can easily see DD getting the better of BA. Thanos should be able to defeat the Silver Surfer as he has done in the past. Good Battle though
Wait maybe I'm confused. I've been seeing a few matches with a + meaning that they're two individuals combined into one being i.e. Thanos + Darkseid = Thanosied and I assumed that the same applied to this battle that Thanos + Doomsday = T.Day and that Silver Surfer + Black Adam = Black Surfer/Silver Adam. Either way the side with Thanos wins.