World number one Spaniard, who has suffered an injury scare in her fourth round victory of Juan Martin Del Potro on Monday, there were no signs of discomfort as his opponent moved to the Florida-based.
Nadal, looking for 11 Grand Slam title at Wimbledon this week, now face Briton Andy Murray, fourth seed, the semi-finals on Friday.
Nadal, looking for 11 Grand Slam title at Wimbledon this week, now face Briton Andy Murray, fourth seed, the semi-finals on Friday.
"I am pleased that the semi-final is still a dream for me," Nadal said, pleased, who reported no lingering After Effects on his foot injury.
"Today was much better.
Care work, I'm fine.
The previous fight was harder, because I really do not know if I had a serious injury. "Friday's meeting with Murray will be a repeat of last year's semi-final against Scotland, won by Nadal in straight sets.
Overall, Nadal leads 11-4 match between the Murray.
"It's always an honor to play against him.
He played great in the past few months.
It's always good to play against Andy, "said Nadal, who also beat Murray in three sets in the quarterfinals at Wimbledon in 2008.
Nadal had lost the last five meetings against the 29-year-old fish, and its soft, never seriously threatened on Wednesday.
Fish had dropped only one service game in his four matches leading to the quarter-finals, but his game is the victim of a brutal bully ground strokes from Nadal that 25 years has led to a lead of two.
Fish was broken three times in the first set alone as Nadal took full control, and the American companion was soon in trouble in the second set.
The breakthrough came in the fourth game, when the fish responded to 0-40 down only to see him break Nadal again.
Fish do some 'flu Nadal's serve was the top seed to serve the set 6-3.
The third set began worrying for the fish when it was broken in the opening match.
But fish suddenly began to find his range, and raised against the urge to play a vital break.
Serve a lot more consistency and confidence in the fish grew.
The set went with serve until game 12, when the American was a great performance to have two break points before getting the set with a right hand driven.
However, Nadal was soon back on track in the fourth set, securing a break in the third game to regain the initiative was never to surrender.