MIAMI -- The Florida Marlins squandered a late five-run lead but still managed to reach the .500 mark for the first time since mid-May.
"I thought he was out. I didn't see Zaun drop the ball," said Marlins manager Fredi Gonzalez, whose team led 6-1 after seven innings.
Zaun said he should have made the play despite the short hop.
"It's not one I haven't made dozens of times in my career before. It just took a funny little squirt to the right and I didn't catch it in a good part of the mitt," Zaun said.
Ramirez hit his second career grand slam and Dan Uggla homered for Florida, which improved to 36-36, its first time at .500 since May 13.
Matt Wieters homered and added an RBI single for Baltimore.
Burke Badenhop (5-2) pitched two scoreless innings for the win.
Lindstrom failed to earn the save two nights after allowing two ninth-inning runs in saving a 6-5 victory against the New York Yankees.
"It's inexplicable, I can't put my finger on anything except I have to do a better job and take responsibility for what happened," Lindstrom said.
Ramirez's grand slam highlighted a five-run seventh that gave Florida a 6-1 lead.
"It was a hanging split-finger to Ramirez. I threw a good one before that," Baez said.
Uehara is now 0-4 with six no-decisions since his last win, on April 13.
Florida's Andrew Miller pitched one-hit ball through seven innings, allowing one run, two walks and striking out four. He retired 13 straight batters at one point.
"I was throwing out of the windup a lot tonight, which was nice," Miller said.
Uggla's 14th homer tied at 1 in the fifth.
Florida's Leo Nunez left the game with a sprained right ankle after facing two batters in the eighth, including Wieters' homer
Ramirez hit his first grand slam off Washington's Steven Shell on Opening Day. ... The Orioles recalled RHP Chris Ray from Triple-A Norfolk. ... Baltimore SS Cesar Izturis (appendicitis) joined the team in Florida. "He started some light activity, some running, jogging, swinging the bat off the tee, playing catch," said manager Dave Trembley, who added Izturis likely would need a week before increasing the workload. ... Trembley said RHP Dennis Sarfate (circulatory condition) was ready to start throwing off the mound in his rehab.