Marmol spent the first three years of his pro career as a catcher/outfielder, and unlike many former hitters who convert to the mound, he wasn't totally lost at the plate. He batted .273 while showing gap power and speed, but his powerful right arm was too hard to ignore. The Cubs made him a full-time pitcher in 2003, and he responded by leading the Rookie-level Arizona League in strikeouts. He followed up by tying for the low Class A Midwest League lead in wins in 2004, and a solid year in high Class A earned him a spot on the 40-man roster following the 2005 season. While he still has to develop more feel for pitching, particularly with his command, he's ahead of the game considering his inexperience. His fastball jumped a couple of ticks to 92-94 mph last year, and he also made some progress with his hard breaking ball, which is closer to a slider or a cutter than a curveball. Marmol also is doing well learning a changeup. If everything comes together, he could have three plus pitches. If not, he's an intriguing power arm for the back of the bullpen. He'll return to Double-A this year.
After signing him as a catcher/outfielder, the Cubs eventually decided to use Marmol's strong arm on the mound. He took to the conversion quickly, leading the Arizona League in strikeouts during his first summer as a pitcher. At times, Marmol flashed a plus-plus fastball and an above-average curveball, though he's still far from consistent. He usually pitched at 90-92 mph with nice life on his heater when he kept it down in the zone. Marmol is picking up a changeup quickly for a converted position player, and he throws a cut fastball that's too slurvy right now. There's a fair amount of effort in his delivery, so he struggles to command his pitches at times. If Marmol rounds out his repertoire, he could be a No. 3 starter. If not, he could be an effective set-up man. He'll continue to pitch out of the rotation this year in high Class A.
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