The A’s, who began the day with the best record in the majors, matched their worst skid of the season by losing four in a row. They’ve dropped six of seven overall.
Teheran (11-9) gave up two runs on four hits and three walks. The Braves had lost 12 of 15 before winning the first two games of the series.
Craig Kimbrel got his 36th save in 40 chances.
Sonny Gray (12-7) allowed four runs in 5 1/3 innings in his fourth straight defeat.
There was a brief delay in the bottom of the sixth when a nude man ran onto the field. He was quickly tackled by security officers and taken off the field.
Stephen Vogt hit a two-run homer and John Jaso also homered for Oakland. The A’s also lost four straight from May 22-25.
The teams wore throwback uniforms as Atlanta celebrated the 100th anniversary of the 1914 Boston Braves’ World Series win over the Philadelphia A’s.
Atlanta closed it out after Josh Reddick led off the A’s ninth with a long fly ball that Justin Upton caught at the left-field wall.
Freddie Freeman hit an RBI double and scored on Johnson’s single to give Atlanta a 2-0 lead in the first. Upton led off the fourth with a single and scored on Andrelton Simmons’ two-out, bloop single to left field for a 3-0 lead.
Upton walked to lead off Atlanta’s sixth and scored from first on Johnson’s third hit, a hit-and-run single to left-center.
Jaso’s homer off Jordan Walden in the eighth cut the lead to one run.
Athletics: SS Jed Lowrie, placed on the 15-day disabled list on Thursday with a broken right index finger, has remained with the team and has even fielded grounders.
Manager Bob Melvin said Lowrie is trying to keep himself “as close to game-ready as he can without overtaxing the finger.”
Braves: Simmons, who did not play Friday night when he had a headache after having two teeth extracted, was back in the lineup. Phil Gosselin, who hit his first homer on Friday night while filling in for Simmons, started at second base and had two hits.
RHP Shae Simmons (strained right shoulder) began a rehab assignment with Triple-A Gwinnett.
Athletics: Jon Lester, who beat the Braves on May 27 while with the Red Sox, will look for his fourth straight win with Oakland. He has won seven decisions in a row overall.
Braves: Mike Minor, who is 1-3 with a 7.17 ERA in four starts since the All-Star break, will try to build on encouraging results in his last start, when he allowed three runs in 6 2-3 innings against the Dodgers. Minor has allowed a .372 batting average in those four starts.