As for locking up STARS..... http://www.fangraphs.com/blogs/the-possible-extinction-of-the-early-career-superstar-extension/ Now, as pointed out, some of these players are Boras clients, and we "know" NYY and LAD will be pursuing Harper/Machado.... Also, I don't think Buxton is a STAR, at least not that you can predict right now. He could maybe be had, but I doubt Sano signs an extension any time soon.