Duncan shot 10-of-16 from the field and nabbed seven rebounds in the Spurs' fifth consecutive victory.
San Antonio put on an 18-6 run late in the fourth quarter to overcome an 80-79 deficit with 6 1/2 minutes to play. Duncan scored seven points down the stretch.
The second half began tied 50-50 and remained close the entire second half. The Wizards led 71-70 at the start of the fourth quarter.
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