(AP Photo/Nell Redmond)

CONCORD, N.C. (AP) Defending series champion Brad Keselowski believes he's still the fastest in Sprint Cup, even if his results four months into the season don't bear that out.

Keselowski is winless and seventh in points heading into the Coca-Cola 600 at Charlotte Motor Speedway on Sunday night. He opened the season with four straight top-four finishes and seven top 10s in the first eight races.

Recently, he's struggled to stay near the top with a 33rd -place finish at Richmond, an 11th at Talladega and a 32nd at Darlington.

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