A lack of year round consistency is likely to ensure that three-times grand slam champion Stan Wawrinka does not topple Britain's Andy Murray from the top of the rankings, the Swiss has said.
Wawrinka, who won his third grand slam title by beating Djokovic at the U.S. Open this year, has been drawn in the same group as Murray at the ATP Finals, but feels he does not have the consistency to leap to the top of the rankings.
"I know I can beat every player, I need to do it more often in the year if I want to think about that, but so far I'm way off that," the world number three Wawrinka said when asked whether he could become the top ranked player.
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