The Atlanta pitcher gave up three runs and four hits in 4w innings in his big league debut and the Braves lost 3-0 to the Philadelphia Phillies on Saturday night.
Fill-in starter Kyle Kendrick and four relievers combined on a five-hitter and Ryan Howard homered for Philadelphia.
Teheran, the Braves' top pitching prospect, was called up because they needed a spot starter after playing a doubleheader Wednesday. He's headed back to the minors after his cameo with the big club, but he left quite an impression.
"I got more confidence after the first couple innings," Teheran said through an interpreter. "It was very exciting. I tried my best. It's been the best moments of my life."
Braves manager Fredi Gonzalez said he thought Teheran "did a good job."
"I didn't see any deer-in-the-headlights look," Gonzalez said. "It was nice to see. We thought this guy could handle it and be better for it. He did great."
The 20-year-old right-hander is 3-0 with a 1.80 ERA in five starts for Triple-A Gwinnett this season. He has 25 strikeouts and has limited opponents to a .118 batting average.
"He's definitely a good prospect, he's smooth, he's got a big future," Phillies manager Charlie Manuel said.
Kendrick (2-2) allowed two hits, walked one and struck out three in five innings. He filled in for Roy Oswalt, who went on the disabled list Friday with lower back inflammation.
Kendrick left after 69 pitches. J.C. Romero and Michael Stutes each allowed one hit in one inning. Antonio Bastardo worked a hitless eighth and Ryan Madson finished for his third save in three tries.
One night after wasting Cliff Lee's 16-strikeout performance in a 5-0 loss, the Phillies got runs in the second, fourth and fifth off Teheran.
Ben Francisco walked leading off the Philadelphia second. He advanced to third on Brian Schneider's one-out single and scored on Pete Orr's groundout to second.
Howard's homer gave the Phillies a 2-0 lead in the fourth.
BARBARA JOHNSTON/ASSOCIATED PRESS
Atlanta's Jason Heyward beats the throw to Philadelphia shortstop Jimmy Rollins after tagging up on a sacrifice fly during the sixth inning of Saturday's game. Heyward was stranded after Brian McCann grounded out for the third out. The Phillies won 3-0.