Robinson was originally selected by Kansas City in the 25th round of the 2007 First-Year Player Draft. In 2011 he was named to both the Pacific Coast League mid- and post-season All-Star teams after finishing third in the league in hits (164), fourth in total bases (268), tied for seventh in RBI (100) and eighth in batting average (.326).
In 2010 the left-handed hitting first baseman won the Texas League Triple Crown after batting .335 with 29 home runs and 98 RBI while also leading the league in doubles (41), total bases (298), slugging percentage (.625) and OPS (1.035).
Mazzaro split the 2012 campaign between Omaha and Kansas City. He posted a 2-2 record along with five saves and a 3.63 ERA (67.0ip/27er) in 22 games (eight starts) with the Storm Chasers and a 4-3 record and 5.73 ERA in 18 appearances (six starts) with the Royals.
The 26-year-old Mazzaro was originally selected by Oakland in the third round of the 2005 First- Year Player Draft. He made his Major League debut in 2009 and began his big league career with 17.2 consecutive scoreless innings, which is the longest by a starting pitcher in Oakland history.
Mazzaro has a career record of 15-21 along with a 5.22 ERA in 66 appearances (45 starts) in the Majors with Oakland (2009-10) and Kansas City (2011-12).