Why Juan Martin del Potro is the X factor
Every once in a while, you get an X factor in tennis, a circumstance or individual who might unexpectedly have an enormous impact on the status quo or force the obvious script to go awry.
A change of surface at a tournament, a rainout, the switch to a new and different ball, the emergence of a new star or the resurgence of a veteran can all have a significant effect on the way things work out. The X factor in tennis right now is Juan Martin del Potro.
Del Potro hadn't hit ...
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