Why the massive downturn in Lukas defense?

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Through three games of the NBA Finals, Luka Doncic's defense has taken a noticeable downturn to the point where he fouled out of Game 3 with 4 minutes left in the game. While never a stout defender, why has his defense looked so poor vs. Boston? Will he ever be able to contain his emotions towards the referees?

Why the massive downturn in Lukas defense?

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Why the massive downturn in Lukas defense?
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