Top seed Roger Federer begins against Colombia's Alejandro Falla, while Nadal plays Kei Nishikori of Japan.
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No. 3 David Ferrer won in straight-sets against Japan's Kei Nishikori, cruising to a 6-4 6-2 success.
"In order to win, you have to spend, " commented Kei Grieg Toyomasu, Director of Marketing, Opera Software.
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France's Gilles Simon will face Japan's Kei Nishikori following a straight forward 7-5 6-3 win over Victor Hanescu.
What Kei has, he has mobility, he creates and he has unbelievable hands and feet that you can't purchase.
Kei (pronounced K) cars used to be the Yugos of the auto world cheap price and low quality.
The world No. 3 will next play Japan's Kei Nishikori, who he beat in last year's Australian Open quarterfinals.
Kei cars are so hot these days, they account for about one out of every three cars sold in Japan.
For example, a single Kei Igawa deal for the Kansas City Royals could easily set the franchise back five years.
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Most observers see eldest daughter Pansy Ho and fourth wife, Angela Leong On Kei, as the main protagonists behind the dispute.
Japan's 24th seed Kei Nishikoro also went through, and will play either Simon or Benneteau if he beats Australia's 94th-ranked Matthew Ebden.
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Murray, the 2012 U.S. Open champion, will play Carlos Berlocq in the fourth round after the Argentine upset 16th seed Kei Nishikori.
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Japan's Kei Nishikori, the 17th seed also made the last 32 with a 6-2 6-2 6-4 win over home qualifier Tim Smyczek.
Japan's Kei Nishikor i secured the U.S. National Indoor Championship later Sunday with a 6-2 6-3 win over Feliciano Lopez of Spain in a one-sided final.
You would be unlikely to confuse Mitsubishi Motors's latest kei car with a Mercedes or a Lexus, but it does have plush seats and a roomy interior.
Meanwhile, defending men's champion Andy Murray reached the final of the ATP event in Brisbane as semifinal opponent Kei Nishikori of Japan pulled out injured in the second set.
The other quarterfinal will be between 21-year-old Canadian Milos Raonic, who beat fifth-seeded Czech Tomas Berdych, and Federer's Swiss compatriot Stanislas Wawrinka -- who defeated Japanese No. 14 Kei Nishikori.
But despite his near two-month absence from competition, the 31-year-old was back in the groove swiftly to set up a meeating with either Japan's Kei Nishikori or Viktor Troicki of Serbia.
In the men's ATP event, which is headed by Britain's Andy Murray, Japanese fifth seed Kei Nishikori began his campaign with a straights sets 7-5 6-2 win over Australian Marinko Matosevic.
He next plays No. 13-seeded Kei Nishikori, who became the first Japanese man in 75 years to reach the fourth round at Roland Garros, beating Benoit Paire 6-3, 6-7 (3), 6-4, 6-1.
The bright spot in Japan's domestic auto industry these days is a kind of car no one's heard of in the U.S. It's the ultracompact, known in Japan as the "kei" car.
Britain's Andy Murray , the sixth seed, beat Switzerland's Stanislas Wawrinka 6-1 6-3 6-3, and will next play Argentina's Juan Martin del Potro , who defeated Kei Nishikori of Japan 6-3 6-4 6-3.
The United States were in silver medal position but poor pommel horse routines from Kei Wen Tan and Raj Bhavsar allowed Japan to finish second after a strong team performance on the high bar.
No. 10 Nicolas Almagro and No. 16-ranked Kei Nishikori also moved on while No. 24 Jerzy Janowicz of Poland rallied from two sets down to overpower India's Somdev Devvarman 6-7 (10), 3-6, 6-1, 6-0, 7-5.
He is scheduled to play his fourth-round match against 16th-seeded Philipp Kohlschreiber of Germany on Monday, when seven-time French Open champion Rafael Nadal hopes to celebrate his 27th birthday with a win against 13th-seeded Kei Nishikori.
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