|How much longer for Andre Agassi?|
The 2006 ATP and WTA Tours present several intriguing questions. Will anyone rise to take on Federer? How much longer will we have the chance to watch Andre Agassi play? How will Martina Hingis play in her return?
There are other questions, dealing with off-the-court issues. The International Tennis Federation has taken over the drug testing. What impact will that have? And how will the ATP's acceptance of an electronic line-calling system change the game?
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