Tennis: Russian Nikolay Davydenko wins title in ATP World Tour Finals

Russian defeats del Potro in final: Nikolay Davydenko of Russia won the biggest tournament of his career Sunday, beating U.S. Open champion Juan Martin del Potro of Argentina 6-3, 6-4 to take the title in the season-ending ATP World Tour Finals in London.

Davydenko, who beat top-ranked Roger Federer of Switzerland in the semifinal round, dominated his service games against del Potro, losing five points on serve in the first set and eight in the second.

"Maybe I had good concentration," said Davydenko, who has reached four Grand Slam tournament semifinals but never made a final. "I was surprised."

Del Potro had three chances to break, but Davydenko saved the point in each case.

"He's very fast," del Potro said. "He plays like PlayStation."

Each player was distracted at least once by a crying baby.

"Maybe he's bored watching our match," del Potro said.

In the doubles final, Americans Bob and Mike Bryan defeated Max Mirnyi of Belarus and Andy Ram of Israel 7-6 (7-3), 6-3 to win their third season-ending title and earn the year-end No. 1 world ranking for the fifth time.