Vanterpool, who works extensively with Lillard, said he feels Lillard this season has had "slippage" in his defense, because he has lost focus on some possessions. But overall, he says Lillard's fundamentals and anticipation have improved each season.
"When he first came in the league, getting posted up was a big concern, a very huge deal,'' Vanterpool said. "Now, it's not even an option for other teams, no matter who it is.''
Lillard said he has become better at recognizing other team's play calls, thereby allowing him to anticipate plays, and Vanterpool said Lillard has learned how to use angles to beat his man to spots on the floor.
"I've said it before: I don't think I'm the greatest defender,'' Lillard said. "But I do feel I have improved each year. I can still get a lot better, but because I can get better, I don't think people realize that each year I have gotten better.''
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For Lillard, defense comes down to one concept:
"You either want to do it, or you don't,'' Lillard said.
He says he wants to not only play defense, but become great at it.
How can he do it?
"That guy right there,'' Lillard said, pointing to Vanterpool.
It was last week in Portland after a game, and Vanterpool had come into the locker room to find CJ McCollum. He was on McCollum's hip, in a defensive stance, showing him positioning and hand placement.
"See the conversation he is having now? He's always talking about having our hands active. Tipping balls,'' Lillard said.
This season, Lillard finished with a team-leading 97 steals, 33 more than he had last season. For context, only three Blazers players in the last 11 seasons have recorded 100 steals - Wesley Matthews (twice), Andre Miller and Ruben Patterson.
The challenge for Lillard, Vanterpool points out, is shouldering the immense offensive load the Blazers demand of him, while also having the mental and physical stamina to play lock-down defense.
"You have to want to shut someone down, and I'll tell you, it's (hard). Especially when you have the responsibility to score,'' Vanterpool said. "But I think it's good and important that he accepts that challenge and looks at it like he has to take it as a personal challenge defensively. That's the first step when it comes to getting better.''