1. Astros Callis: Brady Aiken, LHP, Cathedral Catholic HS (San Diego) -- Combines stuff and polish better than anyone in this deep pitching class, including the college arms. Mayo: Carlos Rodon, LHP, North Carolina State -- He'll solidify his place atop the Draft before June. 2. Marlins Callis: Rodon -- Entered the year as the strong favorite to go No. 1, and despite a good but not great spring, he could still get there if his 15-strikeout outing against Georgia Tech on Friday heralds a strong finish. Mayo: Tyler Kolek, RHP, Shepherd (Texas) HS -- The Marlins like young pitchers with front-line potential. Kolek and his 100-mph fastball fit that description. 3. White Sox Callis: Kolek -- Chicago loves power arms and high ceilings, and no one in this Draft class throws as hard as consistently. Mayo: Jeff Hoffman, RHP, East Carolina -- Assuming he's healthy, he fits the mold of college arms White Sox like, but with more upside. 4. Cubs Callis: Hoffman -- Before he missed his start last weekend with minor arm soreness, Hoffman was pushing past Rodon. If healthy, he'd be a nice fit for Chicago. Mayo: Aiken -- Could very easily go in the top three, and I can't see him going any later than this. 5. Twins Callis: Alex Jackson, C/OF, Rancho Bernardo HS (San Diego) -- Easily the best position player available, could become a full-time right fielder to expedite his bat to the big leagues. Mayo: Jackson -- Best bat in the class, but will he stay behind the plate? 6. Mariners Callis: Aaron Nola, RHP, Louisiana State -- College baseball's top-performing pitcher should be the first starter from this Draft to reach the Majors. Mayo: Nola -- Has performed his way up this high, can get to bigs quickly.