Nene tipped in a missed shot by John Wall to boost Washington into a tie with two seconds left in the fourth period and the Wizards then went on to win their second in a row.
After Ariza's key 3-pointer in the extra period, Wall and Bradley Beal combined to hit four foul shots to protect the lead.
Beal scored 29 points, Nene had 20 and Wall pitched in 17 points and 14 assists. Ariza managed just five points and his big 3-pointer was one of only two field goals he made in eight tries.
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