Schlosser, 26, was a member of the Braves' Opening Day roster in 2014, his first Big League experience. In 2014, Schlosser went 0-1 with a 7.64 ERA (17.2 ip, 15 er) in 15 relief outings. The Sarasota, Fla. native spent the balance of 2014 at Triple-A Gwinnett, where he went 7-6 with a 4.17 ERA (99.1 ip, 46 er) in 25 games/15 starts. The 6-foot-4 right-hander has spent the majority of his Minor League career as a starting pitcher and has posted a 29-19 record with a 3.11 ERA (434.2 ip, 150 er) in 98 games/67 starts. Schlosser was originally selected by Atlanta in the 17th round of the 2011 First-Year Player Draft out of Florida Southern College. He was non-tendered by Atlanta on Dec. 2, 2014 and subsequently resigned to a Minor League deal on Dec. 15th. He is not a member of the 40-man roster.
Briceno, 22, spent the entire 2014 season at Single-A Asheville, his first campaign in a full-season league. In 2014, Briceno hit .283 (89-for-315) with 23 doubles, 1 triple, 12 home runs and 50 RBI in 84 games. The Maracaibo, Venezuela native has played 252 Minor League games in his five professional seasons and owns a career batting average of .280 (250-for-893) with 61 doubles, 2 triples, 24 home runs and 128 RBI. He was originally signed by Colorado as a non-drafted free agent on July 3, 2009.
O'Dowd, 24, split the 2014 season between High-A Modesto and Double-A Tulsa, where he combined to bat .271 (114-for-421) with 27 doubles, 3 triples, 5 home runs and 48 RBI in 113 games. The Cleveland, Ohio native has played in 208 career Minor League games and has hit .260 (186-for-715) with 36 doubles, 8 triples, 7 home runs and 73 RBI. O'Dowd was originally selected by the San Diego Padres in the 23rd round of the 2012 First-Year Player Draft out of Dartmouth University. He was released by San Diego on March 28, 2013 and signed by Colorado to a Minor League deal on March 31, 2013.
Aquino, 22, split the 2014 season between High-A Modesto and Double-A Tulsa, combining to go 5-10 with a 5.13 ERA (107.0 ip, 61 er), 38 walks and 83 strikeouts in 18 starts. Aquino was originally signed by Colorado as a non-drafted free agent on July 2, 2009. The San Pedro de Macoris, Dominican Republic native has gone 27-26 with a 2.84 ERA (453.2 ip, 143 er) in 75 games/74 starts in his Minor League career.
The Rockies currently have a full 40-man roster.