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How to decipher MLB scouting scale, Guerrero Jr.’s prospect grades

Toronto Blue Jays prospect Vladimir Guerrero Jr. warms up before the 2017 All-Star Futures Game. (Lynne Sladky/AP)

Following the progression of a minor-league ballplayer can sometimes feel like deciphering hieroglyphs.

The third baseman has an 80 hit tool and 65 power, but runs and fields at 45.

OK, it’s not exactly ancient Egyptian script. But if you’re not well-versed on the numerical system that’s used to assess baseball players, it could be lost on you.

That system is called the 20–80 scouting scale and talent evaluators have used variations of it for over 50 years.

If you’ve been tracking Toronto Blue Jays mega prospect Vladimir Guerrero Jr., you’ve likely come across his report cards. For example, MLB Pipeline recently handed the slugger its first-ever 80 hit tool and then, on Tuesday, offered more grades for fellow Blue Jays prospects.

We devoted our latest edition of Sports Explained to helping you understand what these ratings mean and where they come from.

You can check out the video here:

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54 Comments

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  • 3 years ago
I thought AA left the system completely bare. How can it be top 10 in baseball again so quickly? And why are most of the top 30 prospects drafted by AA & Brian Parker?
  • 3 years ago
Reply to @Mancash:
So three guys that have a combined 100+ MLB starts aren't at the level of three guys who have a combined 21 MLB starts with 18 coming from Biagini. C'mon, man. You actually believe that lemon statement you're selling? I'm not saying the current Jays can't surpass the three former Jays but just about on every level, I'd take the traded Jays. First, they are already in the MLB. Second, their pedigree is/was much higher as both Norris and Hoffman were top 50 prospects. Biagini ... » more
  • 3 years ago
I wonder what the MLB scouting scale is for The Cleveland Clowns.
  • 3 years ago
Reply to @Jose Meowtista: about 80 points higher than it is for you
  • 3 years ago
I self evaluated my ball skills using the scouting scale and got all 80's. I somehow managed to fly under the radar and didn't get drafted. someone messed up somewhere
  • 3 years ago
Reply to @J Jonah Jaysfan: That's rough man, I think you should DEFINITELY file a grievance for that.
  • 3 years ago
This confirms the notion that Vladdy is not really well-suited for the outfield. He doesn't really have the speed needed to play either corner. 3rd base (or 1st) is where he's most valuable to the Jays.
  • 3 years ago
Reply to @Down right nasty: Actually, left field would be easier for Vlad to play than 3rd base, the hot corner. If anything, he isn't fast enough to play 3rd base. LF, 1st base or DH are his more suitable positions.
  • 3 years ago
Press is putting way too much pressure on Vlad jr. Jays may have an exceptional talent but he is till only 19 and will take time to mature
  • 3 years ago
Reply to @JPE60: may as well get used to the stardom now!
  • 3 years ago
its all relative but hopefully this stuff is way more useful and much less arbitrary than that WAR stat amiright
  • 3 years ago
Might be time to stop referring to Guerrero as a third baseman. Maybe lf, 1st base or DH. Sign Donaldson to an extension and move on. I wonder how Bo was rated for speed and defense.
  • updated 3 years ago
Reply to @Mancash: You don't need speed to play 3rd base, you need fast twitch muscle and Vlad has plenty. He'll be fine at 3rd
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