MIAMI -- Since Aug. 6, Bronson Arroyo has been unbeatable.
The 35-year-old right-hander came into Friday night's game 5-0 in his last six starts, having gone six innings or more with three runs or fewer allowed.
But he wasn't his shutdown self, and 21-year-old rookie Jacob Turner pitched a two-hit gem over seven innings as the Reds dropped the series opener, 4-0, to the Marlins in front of 27,111 at Marlins Park.
Cincinnati was shut out for the first time (third overall) since June 28 against the Giants in a 5-0 loss to Madison Bumgarner. The Reds hold an 11-game lead over St. Louis in the National League Central after the Cardinals lost to the Dodgers, 8-5. The Reds' magic number to clinch the division moved to seven.
"We just couldn't get anything going," Reds manager Dusty Baker said. "It was no balls and two strikes before you look up and there were two outs and nobody on base. He threw a good game against us tonight. Bronson didn't throw badly, we just didn't score any runs tonight. It's been a long time since we've been shut out. I can't remember the last time. You just got to say he threw a great game."
Miami scored four runs over a three-inning stretch as Arroyo lost his first start since Aug. 6 against the Brewers. The righty had won eight of his past nine decisions.
The Marlins took a 1-0 lead in the third inning thanks to Justin Ruggiano's RBI double.
Rob Brantly singled to lead off the frame, but Turner failed to lay down a bunt. Bryan Petersen singled up the middle, putting runners at first and second. Ruggiano connected on a full-count pitch to left-center, driving in a run.
Arroyo escaped further damage by working out of a bases-loaded jam. Jose Reyes popped out to second and Arroyo walked Giancarlo Stanton to load the bases before Carlos Lee grounded out to short.
Greg Dobbs turned on a 2-2 pitch for an upper-deck leadoff homer in the fourth -- his fifth long ball of the season -- that extended the Marlins' lead to 2-0.
Three hits and aggressive baserunning resulted in an additional two runs for Miami in the fifth.
Ruggiano and Reyes produced back-to-back one-out singles off Arroyo. After Stanton popped out to second, Lee singled to right, scoring Ruggiano on right fielder Jay Bruce's off-target throw.
As the play continued, catcher Ryan Hanigan's throw to second trying to get Lee enticed Reyes into racing home, where he beat the throw from Wilson Valdez.
"I felt really good," said Arroyo, who is 0-1 with a 5.84 ERA in two starts against Miami this year. "I had command, I had really good movement on my sinker today. Kind of did what I wanted to do with the lineup. That extra hit by Carlos Lee hurt, and obviously that extra run coming in after that really killed us. But that's the way it goes. It's a big league ballgame and they played better than us."
The Reds mustered just two hits in seven innings against Turner -- Todd Frazier's two-out double in the second and Joey Votto's one-out single in the fourth.
"Just being aggressive early, and trying to get ahead as much as I could," said Turner, who went a career-high seven innings and walked two batters. "When I didn't get ahead, I was able to make quality pitches when I was behind in the count and not really give in."
Frazier hustled on a soft fly ball for a two-out double and moved to third on Turner's wild pitch. Drew Stubbs stranded him when he grounded out to third on the next pitch. That marked the only time a Cincinnati baserunner was just 90 feet from home.
Votto singled to left with one out and advanced to second on Ryan Ludwick's grounder to the pitcher. Jay Bruce struck out to end the threat and now has just one hit in his last 21 at-bats. Following a leadoff walk to Frazier in the fifth, Stubbs sent a ball deep to right field that Stanton caught at the warning track, just in front of the visiting bullpen.
"He's very impressive in the zone, impressive how few walks he's thrown over his last few starts," said Votto, who holds a .321 batting average against the Marlins. "I think it bodes well for him. I think that's a tendency with a lot of good pitchers. They don't like to get beat by walks."
Pinch-hitter Xavier Paul singled off Heath Bell in the eighth with one out for the only other hit against a Marlins pitcher.
"This ballpark negated our long ball too, because Brandon hit one a ton out there and Joey hit one at the end, and those balls weren't even close," Baker said. "They know how to pitch and play in this ballpark."
Christina De Nicola is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.