"Rafa played good points in those moments, playing aggressive".
"I had my 300th win of my career at the US Open in 2014, so this is also a attractive one and I hope I'm going to continue and get the three more here".
"It was a great battle", said Nadal, who is chasing his second Melbourne title.
The result means Nadal stays on track to win his second Australian Open title and 17th Grand Slam singles title.
There were six service breaks as Nadal could not shake off the tigerish Argentine, who levelled the match by winning the tiebreaker when the top seed's forehand was long. "I hope I'm going to continue and gather three more here".
Rybarikova actually gained the first break of serve in the third game but Wozniacki soon settled into her rhythm and broke back immediately before taking control.
The seventh seeds converted four of 10 break points and hit 19 winners to set up a second-round match against Maria Jose Martinez Sanchez of Spain and Marcelo Demoliner of Brazil, who defeated United States duo Nicole Melichar and Nicholas Monroe 6-2, 6-3.More news: Trump Appointee Carl Higbie Resigns Following Offensive Comments
"It was a good test for me".
"It was an unbelievable match, a lot of ups and downs", Cilic said in his on-court interview.
The Taiwanese-Chinese duo are to face Czech fourth seeds Lucie Safarova and Barbora Strycova, who had to rally from a set down before overcoming Sorana Cirstea of Romania and Beatriz Haddad Maia of Brazil 2-6, 6-0, 6-4. "Moments under pressure", Nadal said.
Schwartzman dug deep to save two match points on his serve, conjuring some brilliant winners in the process. He had 36 aces, and some second serves recorded at faster than 202 kph (125 mph).
"Pablo came back and really gave me a lot of trouble". "But moments like this helps to be more confident in yourself, in your body".
After saving match points and coming back from 5-1 down in the third set of her second-round win, No. 2-ranked Wozniacki said she was "playing with the house money" and had nothing to lose.
In a match which lasted just under four hours on the Rod Laver Arena, the 24th seed Argentine, provided the world number one with his toughest match of the competition to date. Next up for her is a meeting with Carla Suarez Navarro, who won a thriller 4-6, 6-4, 8-6 against Anett Kontaveit in the round of 16. Brisbane International champion Elina Svitolina beat Denisa Allertova 6-3, 6-0 in a match that started just before midnight.
Elise Mertens extended her winning streak to nine matches with a 7-6 (5), 7-5 victory over Petra Martic, reaching the quarterfinals in her first appearance in the Australian Open women's main draw.