By Martyn Herman
Until this week, Melzer had never made it beyond the third round of a grand slam. He has met Nadal twice, the Spaniard winning both, and a Melzer victory would top any of the shocks seen here so far.
"I'm in the semi-finals against Melzer and it will be a very difficult match. I'm focused on that match right now," said Nadal who looks set to get the perfect chance to avenge last year's fourth-round defeat by Soderling in Sunday's final should they both play to form in the semis.
(Editing by Alison Wildey, To query or comment on this story email firstname.lastname@example.org)