Click For Photo: https://images.tmz.com/2019/05/22/0522-isaiah-rider-tmz-1200x630.jpg
Isaiah Rider's wife was involved in a fight with another mom at a youth basketball tournament in Arizona ... with Isaiah allegedly threatening to get his gun from his car, this according to the police report.
48-year-old Rider -- who spent 9 seasons in the NBA -- is the head coach of the SkyRiders basketball team, which was playing a tourney at the Inspire Court gym in Mesa, AZ on May 17.
Cops - Tournament - Reports - Parents - Isaiah
Cops responded to the tournament over reports of parents fighting -- and when they got there, they spoke with Isaiah's wife, Vanessa ... who said she had been attacked by another woman for "no viable reason."
Vanessa Rider also claimed her 9-year-old son was physically assaulted by an older boy and injured during the altercation.
Cops - Woman - Story
When cops arrived, they found the other woman ... but she told a completely different story.
The woman claims her son's team had defeated the SkyRiders so Vanessa was bitter -- with Vanessa calling her...
(Excerpt) Read more at: TMZ
Wake Up To Breaking News!
Don't touch that, you don't know where it's been.