Chavez (2-2) picked up the win Tuesday, allowing one hit over three scoreless innings of relief in a 12-0 victory over the Nationals. He struck out three without walking a batter.
Chavez (1-2) took the loss and was charged with his first blown save of the season Monday against Milwaukee, giving up three runs on two hits and a walk over one inning of relief. He failed to strike out a batter.
Chavez has a 1.21 ERA, 1.08 WHIP and 24:10 K:BB through 29.2 innings over 23 appearances this season.
Atlanta selected Chavez's contract from Triple-A Gwinnett on Thursday, Justin Toscano of The Atlanta Journal-Constitution reports.
Chavez signed a minor-league contract with Atlanta on Monday that includes an invitation to spring training.
Chavez agreed Sunday with the Twins on a one-year, major-league deal, John Bonnes of TwinsDaily.com reports.
The White Sox released Chavez on Saturday, Bob Nightengale of USA Today reports.
Chavez signed a minor-league contract with the White Sox on Thursday and received an invitation to major-league spring training, Daryl Van Schouwen of the Chicago Sun-Times reports.
Chavez was informed Friday that he will not be on Atlanta's roster for the NLDS, Mark Bowman of MLB.com reports.
Atlanta activated Chavez (shin) from the 60-day injured list Tuesday.