Fred Kerley is hellbent on clearing his name after being arrested for allegedly hitting his ex-girlfriend ... claiming the narrative she gave police was anything but truth -- and he's preparing to file a lawsuit over the matter.
The Olympic sprinter was booked on May 1 -- after fellow track athlete Alaysha Johnson told cops he hit her once in the "facial area" and caused her nose to bleed while at a Miami hotel.
Kerley addressed the whole ordeal in a statement on social media at the time .