Fognini showed off his array of spectacular shots, nearly doubling Nadal's total of winners.
Friday, and now he'll have to play again on Saturday, while Fognini had a day off.
Fognini wouldn't seem a likely candidate to upset Nadal, no matter how tired Nadal is.
In terms of volume, the most noticeable uptick also came after Roddick defeated Fognini.
FORBES: How Andy Roddick Drove U.S. Open Ticket Prices Up 30%
Nadal will have to play back-to-back days in the best-of-five set format, taking on Fognini on Saturday.
On Saturday, Nadal overcome another sloppy start to get past 27th-seeded Fabio Fognini of Italy 7-6 (5), 6-4, 6-4.
Fognini's eccentricity was summed up in the second game of the second set.
The Serb will face Italy's Fabio Fognini in the last four after he defeated France's Richard Gasquet in straight sets.
Fabio Fognini won the deciding match for Italy against Ivan Dodig, coming from behind to triumph 4-6 6-4 6-4 6-4.
In the last match of the day, Serbian number two seed Novak Djokovic easily saw off Italy's Fabio Fognini 6-3 6-1.
The day before the Roddick-Fognini match, only about 75 tickets were resold on secondary markets for the 4th round evening session.
FORBES: How Andy Roddick Drove U.S. Open Ticket Prices Up 30%
The week before, her royal parents-in-law Prince Charles and Camilla, Duchess of Cornwall, watched Federer outpower and outplay the Italian Fabio Fognini.
FORBES: Royals, Fashion Icons, Tennis Greats And Actors Show Up At Wimbledon
But in the 24 hours after Roddick defeated Fognini, the number of tickets for the 4th round match featuring Roddick jumped to 378.
FORBES: How Andy Roddick Drove U.S. Open Ticket Prices Up 30%
Seven-time champion Rafael Nadal had to come from behind yet again and reached the fourth round by beating Fabio Fognini 7-6 (5), 6-4, 6-4.
Earlier this month, Nadal dumped Fognini in straight sets in Rome, and one would expect the same Saturday, assuming Nadal feels more like himself.
"Yesterday, the conditions were not the ones I like very much, " the No. 5 said after setting up a clash with Italian Fabio Fognini.
Berdych lost 6-4 6-2 to 32nd-ranked Italian Fabio Fognini, who earned his first Masters-level quarterfinal appearance -- a clash with French seventh seed Richard Gasquet.
CNN: Nadal 'relaxed' as rivals struggle at Monte Carlo Masters
Nadal will take comfort in knowing that he beat Fognini, a talented right-hander and former French Open quarterfinalist, 6-1, 6-3 earlier this month at the Rome Masters.
Italy hold the edge in their tie in Turin after Simone Bolelli and Fabio Fognini won their doubles match against Marin Cilic and Ivan Dodig on Saturday.
The Spaniard will next play Italian 32nd seed Fabio Fognini.
Eighth seed Fernando Verdasco avoided a repeat of his first-round exit at Wimbledon to Fabio Fognini, but only just, the Spaniard edging to a 1-6 7-5 6-1 4-6 6-3 victory over the Italian.
The 20th seed scored a convincing 7-5 7-6 4-6 6-4 victory over Italy's Fabio Fognini, but he will have to get past the imposing figure of 2009 champion Juan Martin Del Potro of Argentina to reach the last eight.
Djokovic is likely to be waiting in the semis as he next takes on Italian Fabio Fognini, who won an incredible five-set match against Albert Montanes over more than four hours, despite being barely able to move by the end.
It is doubtful whether even a 100%-fit Fognini could trouble Djokovic, who is showing no signs whatsoever that the pressure is getting to him, or that he is even aware of it, as he continues to cast aside opponent after opponent.
Andreas Seppi gave Italy an early lead as he came from two sets down against Vasek Pospisil to win 5-7 4-6 6-4 6-3 6-3 in three hours and 15 minutes, but Canadian No. 1 Milos Raonic beat Fabio Fognini 6-4 7-6 (7-4) 7-5.
No player in the current game has won more times on grass than the six-time champion, who glided through without breaking sweat as he thrashed Fognini 6-1 6-3 6-2 in just 74 minutes -- five minutes quicker than Federer's first-round win over Spaniard Albert Ramos.
CNN: Federer thrashes Fognini to reach round three at Wimbledon
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