My guesses would be....
Collin Johnson, Texas
Brandon Aiyuk, Arizona State
Michael Pittman, USC
Chase Claypool, Notre Dame
A sleeper pick that I am looking at for day 3 is, James Proche from Southern Methodist. From what I have read and seen, he's a reliable receiver with great hands and good speed. He's 6'0" and might be more of a slot guy, but I think he could be a steal. He'll be at the East-West Shrine game, so keep an eye out.