CHICAGO - The Chicago White Sox have traded outfielder Alejandro De Aza to Baltimore in exchange for right-handed pitchers Mark Blackmar and Miguel Chalas.
Blackmar, 22, is 10-1 with a 3.18 ERA (46 ER/130.1 IP), 83 strikeouts and a .229 (109-475) opponents average in 26 games (18 starts) with Class A Frederick of the Carolina League. Over his last 10 games (all starts), the 6-foot-3, 215-pound Blackmar has gone 6-0 with a 2.09 ERA (15 ER/64.2 IP), allowing just 45 hits.
A native of Corpus Christi, Texas, he is 21-13 with a 3.75 ERA (124 ER/297.1 IP) in 74 games (36 starts) over four minor-league seasons since being selected by the Orioles in the 16th round of the 2011 draft.
Chalas, 22, has combined to go 3-4 with a 4.48 ERA (38 ER/76.1 IP) in 30 relief appearances this season between Frederick and Class AAA Norfolk of the International League. In two games since being promoted to Norfolk, the 6-foot-0, 170-pound Chalas is 1-1 with a 1.29 ERA (1 ER/7.0 IP).
Chalas, a native of Seibo, Dominican Republic, has gone 24-21 with a 3.73 ERA (168 ER/405.2 IP) and 300 strikeouts in 115 games (42 starts) over five minor-league seasons since signing with the Orioles as a free agent on February 24, 2010
De Aza, 30, is hitting .243 (96-395) with 19 doubles, five triples, five home runs, 31 RBI and 15 stolen bases in 122 games with the White Sox this season. He owns a career .267 (500-1,872) average over parts of seven major-league seasons with Florida (2007, '09) and the White Sox (2010-14).