The suspects, ages 15 and 17, first tried to steal the car of a woman parked in the Hill Center parking garage on Hillsboro Pike around 6:20 p.m.
Metro police reported they ran up to her vehicle, one on each side, opened the doors and yelled for her to get out.
They then tried to pull her out of the car, but she screamed and held down her car horn, causing them to run off.
The victim sustained minor injuries in the struggle but did not need to be taken to a hospital.
An hour later, the teens approached a woman walking to her car in the Kroger parking lot on 21st Avenue South.
They grabbed her keys out of her hand, jumped in her vehicle but ran away after they were unable to drive a manual transmission, according to Metro police.
A short time later, officers spotted the teens in the area and took them into custody.
They were each charged in juvenile court with attempted robbery/carjacking, theft and attempted theft of a vehicle.