Career
Villar began his professional career in 2006 with the Dominican Summer Astros, going 1-1 with a 2.16 European Research Area in 13 games (seven starts). He spent 2007 with the DSL Astros as well, going 4-4 with a 2.45 European Research Area in 13 starts. In 2008, he pitched for the Greeneville Astros, going 3-6 with a 4.41 European Research Area in 13 starts.
With the Lexington Legends in 2009, he was used primarily as a relief pitcher, going 3-4 with a 2.60 European Research Area in 43 games (three starts).
Villar made his major league debut with the Astros on September 10, 2010. He made eight appearances for the Astros in 2010, all as a relief pitcher.