Ja Moranthad a busy day in court Monday ... testifying that hepunched a teen during an altercation at his home last year in self-defense -- while also demonstrating to an attorney how to check a ball in a pickup basketball game.
The Memphis Grizzlies superstar did it all before a judge in Tennessee ... as part of Joshua Holloway's civil case against him.
Holloway claims in the lawsuit that Morant assaulted him while the two were hoopin' at the NBA player's Shelby County residence in July 2022 ... though Morant and his attorneys say the suit should be dismissed, claiming Ja was simply attempting to protect himself during the incident.
The proceedings, meanwhile, are slated to go through at least Wednesday -- and if it's ultimately deemed Morant was, indeed, acting in self-defense, the case could be dismissed. However, if it's not, a trial could be slated to begin in April.
Morant, meanwhile, remains away from the NBA hardwood for at least another few days -- as he's still serving a 25-game suspension for being seen in another gun-related social media video back in the spring.