(AP Photo/Alastair Grant)

LONDON (AP) Rafael Nadal lost to Robin Soderling for the second straight time, falling 6-4, 6-4 Monday in their opening round-robin match at the ATP World Tour Finals.

Soderling, who handed the Spaniard his first loss on clay at the French Open this year, powered his way through the Group B match by keeping Nadal on the move on the hard court at O2 Arena.

"I didn't play really bad," Nadal said. "But in the important moments, I didn't have this calm, this necessary calm, to win these matches against the best players of the world."

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