Miller's winless streak reached 13 straight starts in the slumping Braves' 4-1 loss to the Philadelphia Phillies on Thursday night.
Miller (5-8) gave up four runs and 11 hits, including Domonic Brown's solo homer, in six innings.
"I gave up a lot of hits, some not hit that hard, but that happens," Miller said. "I thought I made some good pitches. The homer was a bad pitch."
Run support continued to be an issue for Miller, who last got a victory on May 17. He has a 3.18 ERA since then, but the Braves have provided just 11 runs for him while he's been in the game.
"We didn't score many runs for him," Atlanta manager Fredi Gonzalez said following Thursday's game as he could have said throughout the winless stretch.
The Braves were playing hours after completing a three-team deal with the Dodgers and Marlins that brought them top Cuban infield prospect Hector Olivera, along with left-handed reliever Paco Rodriguez, minor league right-hander Zach Bird and a first-round pick in the 2016 draft. In exchange, Atlanta gave up left-handed starter Alex Wood and relievers Jim Johnson and Luis Avilan. The Braves also sent the Dodgers injured starter Bronson Arroyo and minor league infield prospect Jose Peraza.
A.J. Pierzynski had two hits and an RBI for Atlanta, which lost for the 14th time in 18 games while dropping its 11th road game in the last 12.
Carlos Ruiz had two RBIs and every Phillies starter had at least one hit as they won their 10th game in the 12 since the All-Star break.
Aaron Harang (5-11), who was making his first start since going on the disabled list on July 2 with plantar fasciitis in his left foot, snapped his losing streak at eight starts. He allowed one run and nine hits with three strikeouts and one walk in five innings to earn his first victory since May 14.
"All his stuff looked sharp," Phillies interim manager Pete Mackanin said. "He certainly looked like a different guy."
The Phillies played for the first time since the reported deal that will send ace left-hander Cole Hamels, along with lefty reliever Jake Diekman, to Texas. Details of the trade with the Rangers still were being finalized on Thursday night, and Diekman was in uniform in the Phillies bullpen. Hamels' locker remained intact although he wasn't seen in the clubhouse before the game or in the dugout during it.
"I didn't see him," Mackanin said. "He might've been lurking in the shadows somewhere."
Ken Giles pitched a scoreless ninth for his second save since taking over the closer's role after Philadelphia traded Jonathan Papelbon to the Nationals on Tuesday. Giles hit at least 100 mph on his first three pitches.
Pierzynski's RBI single in the third gave Atlanta a 1-0 lead, but the Braves wasted a chance to score more in the frame in which they loaded the bases with no outs.
Philadelphia took the lead with two runs in the fourth on Ruiz's two-run single. Ruiz was playing in his 1,000th career game.
Ryan Howard's RBI single in the fifth upped the Phillies lead to 3-1, and Brown hit Miller's first pitch in the sixth inning over the wall in right field. It was the first homer of the season for Brown, who last went deep on Sept. 16, 2014.
Diekman was in an awkward situation of sitting in the bullpen with the knowledge of the impending trade. He was going to be used only in an emergency.
"I have no idea, but just sitting out there, thinking about it, (stunk)," Diekman said. "I feel like it would be a good opportunity if it happens."
Miller appeared to be perspiring heavily throughout the game, and his Braves jersey was soaked on a humid evening. But the right-hander didn't use the weather as an excuse.
"It didn't affect me physically," he said. "Maybe a couple of balls slipped out of my hand. It was really hot, but that's not the reason."
Braves RHP Williams Perez (4-0, 2.88) takes the hill for Atlanta in the second of the four-game series on Friday night. Perez will be starting for the first time since June 26 after going on the DL with a bone bruise in his left foot. David Buchanan (1-5, 7.00) will be recalled from Triple-A Lehigh Valley to start for the Phillies.