SHANGHAI, China—With everyone tired and aching after a long season, Nikolay Davydenko may be at his best. He knows how to take advantage of a weary opponent.

The Russian reached the Masters Cup final with a 7-5, 6-2 victory Saturday over Andy Murray, who seemed exhausted from his upset of Roger Federer a day earlier.

“Murray was very tired,” Davydenko said.

Davydenko will play for the title Sunday against Novak Djokovic, who earlier rallied to oust France’s Gilles Simon 4-6, 6-3, 7-5. Now, Davydenko gets another opponent who is less than fresh—Djokovic neede...

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