Beaubois exited Sunday night's game against the Thunder after fracturing the second metacarpal in his left hand during the second quarter. He is out indefinitely.
The fourth-year guard had played his way back into Rick Carlisle's rotation with two strong performances this week. Carlisle called Beaubois' 18-point, five-assist outing in Friday's win "by far" his best game of the season.
The career of Beaubois, once considered a potential franchise cornerstone, has been marred by injuries. Most notably, his missed the majority of his second season due to a broken foot that required two operations to fix.
With Beaubois entering free agency this offseason, this injury could be the end of his time in a Mavs uniform.