The top seed from the qualification round is matched against the 64th seed, with the second seed against the 63rd seed, and so on.
In the women's final, Italian top seed Sara Errani breezed past second seed Carla Suarez Navarro of Spain 6-0 6-4.
However, 15th seed Marion Bartoli was the second seed to fall on Wednesday when she was beaten 3-6 6-3 6-0 by Russia's Vesna Manasieva .
Seventh seed Ferreira, 31, showed the form which helped him beat second seed Sebastien Grosjean and fifth seed Mark Philippoussis in earlier rounds.
"I stayed aggressive and made sure to have an extra something on my ball, " said fifth seed Sharapova, who will face second seed Elena Dementieva of Russia in the quarter-finals.
BBC: Marion Bartoli defeats Ana Ivanovic at Stanford Classic
In the accompanying WTA event, top seed and World No.1 Victoria Azarenka swept past second seed Maria Sharapova of Russia in straight sets in the final.
In the last four Federer will face sixth seed Andy Roddick , who beat Karol Kucera, conqueror of second seed Juan Carlos Ferrero, 7-6 6-3.
Second seed Novak Djokovic and fourth seed Andy Murray both reached the third round on Tuesday while world number one Roger Federer crashed out to Latvian Ernests Gulbis.
Spaniard Nadal, the second seed in Monaco, defeated 10th seed Tomas Berdych of the Czech Republic 6-0 7-5 in Saturday's semi-finals.
Ricketts now meets Frenchman Thierry Lincou after the second seed beat England's 10th seed Adrian Grant, the Yorkshire-based Londoner 11-6 11-6 11-9.
She was not the only big name in trouble as second seed Caroline Wozniacki and Russian 10th seed Maria Sharapova both struggled to advance.
World number one Serena Williams pulled out with a knee injury ahead of Saturday's semi-final against Dementieva, before Mauresmo beat second seed Jelena Jankovic in the second semi.
French second seed Amelie Mauresmo overcame stubborn Russian fifth seed Svetlana Kuznetsova 7-6 4-6 6-2 and plays Australia's Alicia Molik for the other final place.
The second seed, who had been boosted by top seed Nikolay Davydenko's earlier defeat, broke his Czech opponent in the first game of a one-sided first set.
Russian second seed Anna Chakvetadze beat Israeli Shahar Peer 6-3 6-4 and plays the winner of Thursday's second-round match between French sixth seed Marion Bartoli and Britain's Anne Keothavong.
On her return, second seed Jackman will face Natalie Grainger, the fourth seed who despatched Egypt's world junior champion Omneya Abdel Kawy 9-0 9-6 9-2.
There are, of course, many what-ifs to take into consideration that can never be proven, but by reversing the ill-gotten win that Seattle notched (the referees admitted to the screw-up and the labor dispute was settled before any other games were played) the Green Bay Packers would currently have 12 wins and automatically have a lock on the second seed with the potential to still grab the first seed.
Defending champion and second seed Maria Sharapova has the tougher test, with Australian Open winner and third seed Victoria Azarenka in her half of the draw.
But Watson, who knocked out second seed and Wimbledon champion Noppawan Lertcheewakarn in the quarter-finals and then ninth seed Daria Gavrilova in the semis, went on to win the next four games.
The second seed will now play Italian Flavia Pennetta for a place in the quarterfinals after she beat seventh seed Vera Zvonareva of Russia.
With the win, the Knicks (51-26) are nearly certain to land the second seed in the Eastern Conference Playoffs, relegating the Indiana Pacers (49-29) to the third seed.
Second seed and defending champion Yanina Wickmayer demolished Simona Halep of Romania 6-0 6-2.
BBC: Heather Watson loses to Shuai Peng in Auckland quarters
The 20-year-old will face either Marcos Baghdatis or second seed Rafael Nadal in the third round.
Second seed Mikhail Youzhny was also beaten, losing 6-2 6-0 to defending champion Jonas Bjorkman .
Djokovic's defeat means second seed Andy Murray is the highest-ranked player left in the draw.
Second seed Elena Dementieva of Russia plays Angelika Roesch of Germany on Wednesday night.
Second seed Sjeng Schalken followed Novak out, when he was beaten 6-3 6-4 by Thomas Enqvist.
Second seed Nicolas Kiefer pulled out of the event in Halle due to a recurring wrist injury.
Second seed Nadal defeated Gael Monflis in straight sets, to book his place against compatriot Nicolas Almagro.
Second seed Stepanek won 6-2 6-1 against Frenchman Gael Monfils, who was struggling with a shoulder problem.
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