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A pair of first-place teams who figure to be upwardly mobile in the next edition of Mark Heisler’s power rankings meet Saturday night in San Antonio when the Spurs host the Denver Nuggets. Neither team has a top 20 scorer, a top 20 rebounder or a top 10 assist man. However, both have established themselves as one of the league’s better teams in the early going. The Spurs are fourth in Heisler’s rankings. They have won two in a row, including Thursday’s demolition