Everbyear, fangraphs puts out a lit if the players they feel have the most trade value, based on a variety of factors.
I saw someone in another thread guess Aaron Sanchez would be in the 40-50 range.
Well here are the 41-50
http://www.fangraphs.com/blogs/2016-trade-value-41-to-50/
Sanchez actually made the honorable mention list, just falling short in terms of track record.
Track Record Just A Bit Short
Marcell Ozuna, OF, Miami
Aledmys Diaz, SS, St. Louis
Wil Myers, 1B, San Diego
Stephen Piscotty, OF, St. Louis
Willson Contreras, C/OF, Chicago
Aaron Sanchez, SP, Toronto
Michael Fulmer, SP, Detroit
Brandon Belt, 1B, San Francisco
All five of these young hitters (plus the Blue Jays and Tigers emerging starters) are having excellent seasons, and if we just accepted that what they’ve done in the first half of 2016 is their new established level of performance, they’d all easily belong. But each has some history that makes it wise to not quite yet accept that this is what they’ll do going forward, and in the case of Ozuna and Myers, they churned through some of their service time getting to this point, so any team trading for them would be acquiring a guy a bit closer to free agency than some other breakout stars of 2016. Belt is a different case than the rest, but his back drop in strikeout rate is still a recent development, and he’ll need to sustain that for a bit longer to crack the top 50, given his age.