Jimmy Nelson's growth from 2016 to 2017 has been unmatched. Does it pass muster after being put under our spotlight?

Justin Upton's added BA to his usual power/speed combination—can it continue? Also J. Garcia, Valencia, Miley and Carrera.

Is this the end of Miguel Cabrera's run as a top offensive producer? Plus Dallas Keuchel, James Paxton, Marcus Semien and Andrelton Simmons.

Clint Frazier entered 2017 as the Yankees top prospect and one of the top prospects in MLB—has he lived up to the hype? Plus, Nick Williams, Matt Chapman, Brent Suter, and Paul Blackburn.

After finishing 2016 with 22 HR in 460 AB, J.D. Martinez (OF, ARI) has 21 HR in just 235 AB so far in 2017. Can he keep this torrid pace? Plus Jonathan Villar, A.J. Ramos, Ben Zobrist, and Luis Perdomo.

Steven Matz is still trying to get back on track after beginning the season on the DL, while Hyun-Jin Ryu is back to looking like himself following a two year absence. Plus, Manuel Margot, Eugenio Suarez, and Javier Baez.

Can Jose Altuve keep up his scorching pace? Also Sale, C. Gomez, Musgrove, Torreyes.

Andrew Benintendi's ADP (120) was higher than his career AB total (105) entering the season. How's it turning out? Plus Mike Fiers, Nomar Mazara, Kelvin Herrera, and Marwin Gonzalez.

Reds rookie hurler Luis Castillo has been lighting up radar guns, but how are his early skills shaping up? Plus, Bruce Maxwell, Carlos Asuaje, Frances Martes, and Adam Engel.

Jake Arrieta hasn't performed up to his recent lofty standard so far in 2017. Is there reason to believe he can right the ship? Plus David Peralta, Scooter Gennett, Wade Davis, and Manny Pina.

We put PHI OF Odubel Herrera's disappointing 2017 under the Spotlight...