It is a MIRACLE neither Derrick Lewis nor his young son were injured in an ATV crash at their home ... in an incident caught on video.
The UFC superstar pulled out an ATV on his driveway and invited his young son to sit on his lap ... when things went terrible wrong.
The boy accidentally grabbed the handlebar, which caused the vehicle to accelerate -- zipping right into a stone planter area.
Somehow, Derrick was able to maintain control of the ATV and kept it from flipping over -- eventually bringing it to stop.