The Lakers beat the Sacramento Kings 121-114 on Sunday night.
It was their first win without injured pair James and Rajon Rondo.
James is set to miss a stretch of games after suffering a groin injury on Christmas Day, while Rondo is recovering from a hand injury.
In the Kings game, Ball scored 13 points, with six assists and two rebounds, as the Lakers showed their strength in depth, with more than four players scoring more than 20 points each.
Kyle Kuzma tallied 18 points, Brandon Ingram 21, Josh Hart 22 and Kentavious Caldwell-Pope 26 in the impressive win.
Speaking after the win over the Kings, Walton explained that Ball can join his team-mates on 15+ points-per-game, but he needs to improve on his pick-and-roll.
Without James in the team, Ball has shone, and averages 19.5 points-per-game with nine assists, as he has shown his more aggressive side.
But Walton noted that there is more to come from the youngster.
“We want him to continue to grow that part of his game,” the coach said of Ball’s pick-and-roll.
“He’s made a big jump so far this season in the games we’ve played.
“As far as do we want to just run pick-and-roll every time? No.
“But we want him in pick-and-rolls a lot, getting downhill, feeling the bigs, making those decisions in traffic.
“Because we believe in his size, ability and feel for the game that he can be a special, special pick-and-roll type of player. We’ve just got to get him more reps with it.”
The Lakers are next in action on Wednesday January 2 as they face the Oklahoma City Thunder.
Tip-off is at 3am UK time.
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