Stanislas Wawrinka "disappointed" by lack of energy in Novak Djokovic loss

Stanislas Wawrinka in action against Feliciano Lopez during round two of the Paris Masters on October 30, 2013
Stanislas Wawrinka feels that a lack of energy cost him against Novak Djokovic at The O2.

Stanislas Wawrinka could not hide his disappointment at missing out on a spot in the final of the ATP World Tour Finals at the expense of Novak Djokovic at the weekend.

The Serb defeated the 28-year-old Swiss 6-3 6-3 on Sunday at The O2 to advance to the final of the competition to face Rafael Nadal.

"I had the feeling that I was playing good, hitting well the ball," Wawrinka told reporters. "But I think I don't have enough energy. Against him, that makes a big difference.

"I'm disappointed with myself because I had the feeling that I could have done something better, but I really think that I was not fresh enough to do something."

Wawrinka has beaten Djokovic just twice in their last 17 encounters.

Serbia's Novak Djokovic returns against Switzerland's Roger Federer during their group B singles match in the round robin stage on the second day of the ATP World Tour Finals tennis tournament in London on November 5, 2013
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ATP RankingsPoints
1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060