The 26-year-old Chavez spent his first full season in the majors with Pittsburgh last year. He went 3-2 with a 5.89 ERA in 28 games with the Braves. The 26-year-old Blanco was called up from Triple-A Gwinnett before Saturday’s game, then dealt away. He has batted a combined .269 in eight minor league seasons.
The 20-year Collins came to Atlanta on July 14 in a five-player deal that sent shortstop Yunel Escobar to Toronto and brought shortstop Alex Gonzalez to the Braves. The 5-foot-7, 155-pound Collins has pitched at Double-A all season, going 1-0 with a 2.29 ERA in 41 appearances.