Watt, a 19-year-old left-handed pitcher, was 9-4 with two complete games and a 4.35 ERA at Rookie Level Ogden. He was a second-round pick in 2007.
Perez, a 20-year-old right-handed pitcher, was 4-2 with a 2.91 ERA in the Gulf Coast League and 0-1 in one 3 1/3-inning start for Ogden in the Pioneer League. He is from Venezuela.
Maddux was obtained from the Padres Aug. 19 for two players to be named or cash. He went 2-4 with a 5.09 ERA in seven starts after the trade.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.