Celtics' RJ Luis: Plays in preseason opener

Luis (knee) generated four points (2-2 FG) in three minutes of Wednesday's 121-103 preseason win over the Grizzlies.

Luis didn't appear in a Summer League game due to left knee soreness, but he's since been traded from Utah to Boston and recovered from the injury. The undrafted rookie was effective in limited action, but he'll have a tough path to regular-season minutes with the Celtics.