Nadal is also looking to leave his mark.
Against Almagro, he faced his toughest test so far of this tournament, though that isn't saying much.
He needed 62 minutes to finish the first set, as Almagro pounded groundstrokes right back at Nadal, matching him game for game.
Almagro was up 5-4 and 30-15, but Nadal took the next three points, including a pair of 118 mph service winners.
They went to a tiebreaker, where Nadal pulled ahead 5-1, before dropping three points in a row. But Nadal answered with a cross-court backhand that forced an error and a service winner on set point that brought a yell of "Come On!"
This is what counts for drama in a Nadal match so far. Ferrer's goal on Friday is to create a little more uncertainty.
"It will be tough against him," Ferrer said, "because he's the best player on clay in history."