Ex-college basketball superstar Isaiah Austin had a great week in L.A. -- hitting up some big parties ... with his former Baylor teammate Quincy Miller.
TMZ Sports has footage of the two hangin' out at Ace of Diamonds on Monday night -- the same night huge stars like Nicki Minaj, Meek Mill and Rae Sremmurd were all turnin' up inside the club.
Of course, Austin was ceremonially drafted into the NBA back in 2014 -- since he's unable to continue playing high level basketball due to a rare medical condition.
But get this ... he went back to school and is currently a marketing major at Baylor.
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