the shanghai masters tennis tournament is underway, with the world number one rank up for grabs depending on how current number one roger federer and number 2 novak djokovic fare.
cri's nate schlabach has more from shanghai.
the race for the number one spot is heating up as we approach the world tour finals coming up in early november.
both roger federer and novak djokovic are battling it out for the number one ranking, which could be on the line this week as china open winner novak djokovic threatens to knock roger federer from the top spot.
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