Both Haas and Murray have had very strong starts to the year. Haas is arguably in the form of his career. Murray's young career is still on an upward trajectory. They're both in form and confident and a SF place in a Federer-less half of the draw is at stake.
And they've neved played.
How will Haas handled the Murray variety? Will he stay calm and work his opportunities and attack the second serve to break Murray's service games down? Or will he get wound up and play into Murray's hands.
How will Murray cope with the Haas powerful, accurate hitting and confident play? Will he be able to force Haas into tricky positions on court or will Haas dictate the play too much for that?
Who will survive?