The Marlins' All-Star shortstop singled to open the third inning off Atlanta's Derek Lowe. After Dan Uggla reached on a check-swing infield single, Ramirez was safe at second base.
Ramirez was going on the pitch, and the shortstop slid hard into the base.
"I just got dizzy," said Ramirez, who expects to play on Monday. "I think I hit the ground too hard when I slid into second. I was stealing, so I never looked in. I slid too hard into the ground. I will be fine."
As Lowe was getting ready to pitch to Gaby Sanchez, Ramirez motioned to the dugout. His right hand was over his chest. Manager Edwin Rodriguez and assistant trainer Mike Kozak went to tend to Ramirez, who doubled over for a second before walking to the dugout.
Donnie Murphy replaced Ramirez at shortstop.
In the first inning, Ramirez belted a three-run homer off Lowe.
Joe Frisaro is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.