One of the things that I include in the Prospect Guide each year is spray charts that include the average, slugging percentage and isolated power to each part of the field for hitters that wind up in the Top 40. What those numbers are to the outfield spots are really the only ones that are important. While a few players did double on balls to the shortstop or second baseman (pop ups that weren’t caught, but weren’t errors), it’s the extra-base hits in the outfield that give us a good look at a guys power.
One thing to note of course is that park factors come into play when looking at things like this. Some parks are more hitter friendly than others, as are some leagues. Here is a quick breakdown of how the different parks and leagues play based on the 2013 season (I have not run the data for the 2014 season on all stadiums yet):

It’s also worth noting that Arizona, Billings and Bakersfield all play in hitter friendly leagues as well. Louisville, Pensacola and Dayton play in leagues that are considered to be neutral.
Now that we have all of that out of the way, let’s take a look at which players had the best Isolated Power to the pull side (all number unadjusted):
The Top 10
| Player | Bats | Pull |
| Taylor Sparks | R | 1.300 |
| Juan Duran | R | 1.103 |
| Marquez Smith | R | .989 |
| Aristides Aquino | R | .978 |
| Donald Lutz | L | .773 |
| Seth Mejias-Brean | R | .736 |
| Sean Buckley | R | .706 |
| Reydel Medina | L | .700 |
| Gavin LaValley | R | .700 |
| Robert Ramirez | L | .676 |
| Average for all 52 qualified players | N/A | .528 |
Taylor Sparks absolutely crushed the ball when he pulled it. His isolated power (batting average subtracted from slugging percentage) was off of the charts good. His 1.300 IsoP is the best over the last three years among Top 40 prospects. It should be noted that three of the four players to top the 1.000 IsoP in that time played in Billings, with only Juan Duran this year breaking the streak. Duran played in Pensacola where the left field is incredibly hitter friendly.
There really aren’t any surprises on the list in terms of the names that show up. All of the guys listed are above-average power potential guys.
How do the rest of the players stack up from the pull side power?
The complete list
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| Player | Bats | Pull |
| Taylor Sparks | R | 1.300 |
| Juan Duran | R | 1.103 |
| Marquez Smith | R | .989 |
| Aristides Aquino | R | .978 |
| Donald Lutz | L | .773 |
| Seth Mejias-Brean | R | .736 |
| Sean Buckley | R | .706 |
| Reydel Medina | L | .700 |
| Gavin LaValley | R | .700 |
| Robert Ramirez | L | .676 |
| Jeff Gelalich | L | .673 |
| Argenis Aldazoro | L | .667 |
| Narciso Crook | R | .654 |
| Cory Thompson | R | .652 |
| Chad Tromp | R | .650 |
| Felix Perez | L | .639 |
| Brian O’Grady | L | .634 |
| Jose Ortiz | R | .632 |
| Alex Blandino | R | .619 |
| Ty Washington | R | .615 |
| Tanner Rahier | R | .600 |
| Juan Silva | L | .583 |
| Phillip Ervin | R | .580 |
| Sebastion Elizalde | L | .563 |
| Joe Hudson | R | .551 |
| Beau Amaral | L | .526 |
| Devin Lohman | R | .519 |
| Kyle Waldrop | L | .517 |
| Jesse Winker | L | .500 |
| Junior Arias | R | .500 |
| Avain Rachal | R | .500 |
| Ryan Wright | R | .489 |
| Jon Matthews | R | .467 |
| KJ Franklin | R | .457 |
| Yorman Rodriguez | R | .453 |
| Luis Gonzalez | R | .444 |
| Carlton Daal | R | .444 |
| Brodie Greene | R | .442 |
| Juan Perez | L | .426 |
| Nick Benedetto | R | .393 |
| Zach Vincej | R | .389 |
| Garrett Boulware | R | .375 |
| Tucker Barnhart (LHH) | L | .364 |
| Neftali Soto | R | .316 |
| Jose Siri | R | .250 |
| Yovan Gonzalez | R | .250 |
| Hector Vargas | R | .222 |
| Sammy Diaz (LHH) | L | .172 |
| Sammy Diaz (RHH) | R | .059 |
| Tucker Barnhart (RHH) | R | .000 |
| Chris Berset (LHH) | L | .000 |
| Chris Berset (RHH) | R | .000 |
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