The home run was Correa's fifth in his past seven games, and he is batting .345 with seven RBI over that stretch.
Crawford slugged a solo shot in the second inning, and then added a two-run blast in the fourth. This was the second two-home run game of Crawford's career, and he now has four big flies in his past seven games.
The Braves did not indicate how long they expect Simmons to remain sidelined with the injury.
Ahmed had been struggling at the plate, as the four hits on Monday matches the total from his previous seven games. The four-hit game was the first of his young career.
Ramirez started the season with the Indians, but struggled offensively. He has hit just .176 one home run and eight RBI while going back-and-forth between the big leagues and Triple-A.
With the Clippers, Ramirez is batting a more-respectable .293 with 13 doubles.
The team is awaiting the results of an MRI before determining how long Simmons will be out, reports MLB.com.
"He took an MRI," Braves manager Fredi Gonzalez said Monday, "[but] Dr. [Gary] Laurie hasn't read it yet. He's going to be here tonight so I'm sure as soon as he reads it, examines him, we'll get a better read on it."
Since a four-hit game June 20, Simmons is batting .196 (22 for 112) in his last 34 games. He has one double, two RBI, six runs, 11 walks and 11 strikeouts in that span.
Hechavarria went 2 for 4 and has five hits in his last three games. He homered for the first time since June 25 and hit his first career walk-off.
Lowrie came back Thursday from a three-month stint on the disabled list with a thumb injury. He is 1-for-7 since his return.
Simmons sustained the injury while diving for a ball in the Saturday defeat to the Phillies. X-rays came back negative, but it remains to be seen how long he is out. He will be evaluated Monday in Atlanta, at which time it will be determined if he needs to go on the disabled list, per MLB.com.
To add insult to injury, Simmons was in a 2-for-20 slide when he went down.
Correa got the Astros on the board early when he slugged a solo home run in the first inning. He later added a two-run shot in the sixth to close out the scoring for the Astros.
The 20-year-old has hit safely in 15 of his past 16 games, batting .357 with three home runs and 13 RBI over that stretch.