If you blinked, you missed Luis Castillo's development into a terrific MLB pitcher following his leap from Double-A to CIN. Castillo tops our very speculative list of NL SP upside candidates.

Aaron Sanchez earned $20 in 2016 as the AL ERA crown winner before being held to 36 IP by finger blisters last year. Sanchez is one of a handful of growth-age, breakout-or-rebound AL pitching candidates highlighted in this week's segment.

After tossing just 25 IP last year due to injuries, Shohei Otani's immediate IP projection looks like a dart-throw, which suggests that he'll fit right in with the rest of LAA's rotation. The HOU and OAK catching outlooks, and more.

Gregory Polanco's hamstrings were the culprit in a down 2017. But with health he's a good rebound candidate, with signs that still point to more. Polanco is part of a deep and potentially undervalued OF list.

Willie Calhoun's potent bat may have found a landing spot in Arlington, where he looks like one of our top AL OF breakthrough picks in 2018.

Amed Rosario's defense and athleticism should fuel 2018 production as the 22-year-old grows into his offensive potential. He's one of our favorite 2018 SS picks as our Dynasty Reload series continues.

Even with plenty of MLB-experienced arms, 2017 disappointment Sean Manaea currently looks like the only decent bet for the OAK rotation as of Opening Day. We cover the fall-out from LAA's busy off-season, SEA's suspect LF spot, and more.

Some consolidation may be in order for meteoric 21-year-old Rafael Devers, but he still looks poised to exceed our $10 R$ target in his first full MLB season. He's one of our favorite 2018 third base breakout youngsters.

Now with rebuilding CHW and a promising 2018 September under his belt, Yoan Moncada has plenty of opportunity, and looks poised to take another step forward. He heads our intriguing 2018 2B contingent.

Greg Bird has had two consecutive seasons trashed by injuries, but with health he still looks like a 30+ HR year waiting to happen. He's just one of several developing 1B who we think can earn $10 or more in 2018.

Francisco Mejia has offensive upside worth waiting on, even if it doesn't come together in 2018. His ceiling rises above the others on our catcher list, as our off-season Dynasty Reload series begins.