Tim Duncan and the San Antonio Spurs have won 18 consecutive games. Will the Thunder challenge them?/AP

18 wins in a row. The San Antonio Spurs are rolling.

Unbeaten in this year’s NBA playoffs, the Spurs swept the Utah Jazz and Los Angeles Clippers to reach the Western Conference finals. They’ve been unstoppable.

They haven’t been tested, either, but that’s all about to change Sunday.

Here come the Thunder. The Oklahoma City Thunder.

The Spurs have the best team, but the Thunder have the two best players in the series in Kevin Durant and Russell Westbrook and the NBA’s Sixth Man of the Year in James Harden.

So make no mistake. The Spurs will lose a game in this series, but will they lose the series?

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