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Cubs Minor League Daily: Checking In On Big IFA Signee Jonathan Sierra

Cubs Minor Leagues and Prospects

The new number nineteen on the midseason Top 40 Jonathan Sierra was recently the focus of a scouting piece from Baseball Census. The video of his at bats is some of the best video we’ve gotten on Sierra and well worth a watch.


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The verdict, in short, is that Sierra, the Cubs’ biggest money IFA signing in the 2015-16 class behind Eddy Martinez ($2.5 million bonus), is extremely raw but has some very loud tools. The 19-year-old needs practice, patience, and to make some significant adjustments in his approach at the plate, but the tools are there for Sierra to turn into a pretty good prospect.

After watching the video, it is easy to see why he has a strikeout rate that is scarier than anything Alfred Hitchcock ever dreamt up. Striking out 30%+ of the time in rookie ball is going to happen when you are getting eaten alive by pitches low and away. That’s an adjustment that I have no doubt is already in progress, and is just the next in a long line of adjustments that he’ll have to make if he’s going to move up the prospect rankings as he moves up the system.

Triple A: Iowa Cubs
Iowa 7, Sacramento 3

Double A: Tennessee Smokies

Tennessee had the day off.

High A: Myrtle Beach Pelicans
Potomac 3, Myrtle Beach 2
One rough inning led to all the Potomac scoring, and masked a pretty good day of Pelicans’ pitching.


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Low A: South Bend Cubs

South Bend had the day off.

Short Season A: Eugene Emeralds
Boise 10, Eugene 2
Not a lot went well for the Emeralds in this one.

Rookie: AZL Cubs
Athletics 7, Cubs 2
The Cubs were held to just four hits.

Other Notes

  • Since returning to Iowa, Victor Caratini has ten hits over seven games, two of them for homers. In that span he has an OPS of 1.174.
  • Baseball Census also has a nice write up on Mitch Stophel, but check your excitement before diving into that link. The Cubs draft a lot of small college, high upside college arms every year, and most of them don’t go anywhere fast even though all of them could give plenty of reason for optimism. The story on Stophel is a good read, but it is going to be another year or so before we know if the Cubs have anything there.

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  • While we wait to know for sure what is up with Willson Contreras‘s hamstring, it sounds like the Cubs already have a contingency plan in place:

  • Something to check out on Cubs pitching prospect Thomas Hatch:


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Luke Blaize

Luke Blaize is the Minor League Editor at Bleacher Nation, and you can find him on Twitter at @ltblaize.