"It's been a little bit up and down," Kimbrel said. "I've been pitching really good one game and giving up some runs in another game. That's part of baseball."
Rendon was only the third player to hit a non-solo homer against the Braves closer, joining Infante and Ramon Hernandez, who also hit one in the 2011 season.
The two-run lead Kimbrel surrendered marked the first time he let a multi-run lead elude him this season, and just the ninth time in his Major League career that began in 2010.
This was the fourth blown save of the season for Kimbrel, who has allowed a run in three of his past eight appearances. He had not allowed more than one run during a save opportunity since the Nationals tagged him for three runs on Sept. 17 at this same location.
"It's unfortunate I've given up some [runs] in big situations the past few weeks," Kimbrel said. "But we've still got a lot of season left to play and I've still got a lot of pitching left to do. So I'll put this night behind me and be ready to go tomorrow."
Stephen Pianovich is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.