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Bionic Poster
The number 2 spot has definitely changed a couple times this year though between Murray and Fed. I'll have to have a look tomorrow though. Maybe I'm thinking of 2015.
Murray has been ranked number #2 all year save for one week at the start of May when he lost it briefly to Fed after failing to defend his Madrid title and despite Fed not even showing up in Madrid.
He regained it the following week after Fed went out early in Rome (failing to defend his finalist points from last year) and has kept it since.