It sounds like Junior Arias isn't the only Reds prospect creating some buzz in the Arizona Summer League. Reds left handed pitcher Ismael Guillon has been pitching very well. Last night he struck out 10 batters in 4.2 innings and now has a 3.15 ERA with 12 BB/41 K in 34.1 innings and has yet to allow a home run. Guillon, as you may recall, was signed by the Reds as a 16-year old out of Venezuela in 2008 during that great International signing class by the Reds that also featured Yorman Rodriguez, Juan Duran, and Junior Arias.

Guillon originally signed for $625,000 but his contract was voided and he resigned a cheaper deal after it was determined he would need Tommy John surgery. The Reds tweaked Guillon's mechanics after the surgery and according to Keith Law, he impressed scouts with a 90-93 mph fastball and good changeup in Instructional League last October. Now at age 18 he's finally pitching in real games and pitching quite well.

I sent Kevin Goldstein of Baseball Prospectus a tweet asking him about Guillon and if he thought he was a potential sleeper.

OnBaseMachine: @Kevin_Goldstein You have any info on #Reds lefty Ismael Guillon? 3.15 ERA and 12 BB/41 K in 34 IP in Arizona. Potential sleeper?

Kevin_Goldstein: Good arm with projection. More than a sleeper.

Interesting. It sounds like Goldstein thinks highly of him.