The Houston Astros inked Sean Mannion Jersey 16 international free agents last winter when the signing period opened. Now, just months before the next slew of big ticket prospects will sign, the Astros inked two youngsters to deals in late September.Julio Marte and Yefri Martinez are both 19-year-old right-handed pitchers, listed at 6-foot-5 and 6-foot- Alec Ogletree Jersey 0, respectively. Marte's 180-pound frame means he's more lanky, and likely to throw at higher velocities, but potentially more susceptible to injuries, whereas Martinez Greg Zuerlein Jersey is a more stout 205 pounds.Hailing from Santo Domingo, Dominican Republic, both were a signed to Dominican Summer League Astros Blue on Monday.Of course, since the DSL season ended weeks ago, their a signment is only a formality, but it's a big leap in the career of these two youngsters, making the jump from academy ball in the Caribbean to profe sional baseball. Darrell Henderson Jersey Scroll to continueTheir journey will eventually take them to the states, though they will likely participate in American Rookie-ball in the Florida Coast League before joining affiliated ball in the upper levels of Houston's farm system in Fayetteville, Asheville, Corpus Christi and Sugar Land.More Robert Quinn Jersey From SI's Inside The Astros: