RHP Rayderson Chevalier (18)
One of the best names in the Astros minor league system, Chevalier signed with Houston as an amateur free agent out of the Dominican Republic in 2012. In his first professional season with the DSL Astros, he was 3-3 in 15 games (five starts) with a 6.44 ERA and a 1.638 WHIP.
One former Astro with a birthday today (you may have heard of him)
RHP Nolan Ryan (66)
Lynn Nolan Ryan (aka the Ryan Express) was drafted in the 12th round in 1965 by the Mets and signed as a free agent with Houston in November of 1979 where he pitched from 1980 to 1988. Despite pitching for 27 seasons with a lifetime ERA of 3.19 and WHIP of 1.247, striking out 5714 batters, throwing 7 no-hitters and appearing in 8 All-Star games, he never once won the Cy Young Award. He was, however, elected to the Hall of Fame in 1999 in his first year of eligibility with a whopping 98.8% of the vote.