Perez, 23 in April, enjoyed a breakout rookie season in 2013, going 10-6 with a 3.62 ERA during the regular season. In 2012, Perez endured a tough year, going 1-4 with a 5.45 while getting used to the big leagues. He made his MLB debut on June 27, 2012. In 2013, Perez was third on the Rangers in starts and innings, while proving large in many of his starts. He won five straight starts in August, pitching to a 3.02 ERA and his first career complete game in that span. He really improved as a pitcher and helped the Rangers win games.
Perez was signed by the Rangers as an amateur free agent in 2007 from Venezuela.