A key weapon in Australia's Davis Cup armoury against Spain this week is being sharpened to perfection, according to captain John Fitzgerald.

The specially-laid grass court at the Tennis Centre is becoming slicker and quicker by the day and will be ideal for the Australians by Friday's opening rubber, he said.

It won't look pretty but it will suit the home team.

"The playing surface is pretty good. It's harder, that's for sure," Fitzgerald said.

"If it was at 50 per cent (ideal speed) the first day I'd say it's at 75 now.

"Two days basically to go and if there's another warm day tomorrow I can't see why it wont be very hard by then.

"Once they stop watering it it goes rock-hard.

"Aesthetically it doesn't look good and everyone thinks if it doesn't look good, it's not a good court.

"That's not the case, a good grass court doesn't have to be aesthetic."

Singles star Lleyton Hewitt has also been honed to his best and now needs to wind down his preparation while Mark Philippoussis has peaked as well.

Brought to you by AAP © 2024 AAP