Li Na's campaign for a second Grand Slam title continued in impressive fashion on Tuesday as the Chinese tennis rebel put an end to fourth seed Agnieszka Radwanska's 13-match win streak.

The Chinese 30 year-old, who won their quarterfinal clash 7-5, 6-3, will compete in a semifinal in Melbourne for the third time in four years.

'This time I really didn't see the draw, I really didn't think like far; just match by match,' she said of her mentality.

Li described Poland's Radwanska as a wall something that sends every ball you hit back. 'She can hit everywhere, but without a mistake,' mused the right-hander, adding that she focused on adding pace and depth to each shot against Radwanska, whom she lost to less than a fortnight ago at a tuneup event.

'She's a very consistent player; she's always playing on the same level, it's not like up and down like the other girls,' the Pole said of Li.

The top-ranked Chinese player revealed she is still haunted by memories of her four wasted match points against Belgian Kim Clijsters at last year's Australian Open.

'It's very tough, you know, because when I was playing [Sorana] Cirstea in Rod Laver [Arena], I was thinking about the match last year,' said Li, adding that the loss was unforgettable.

Hounded by questions about her hiring of Justine Henin's former coach Carlos Rodriguez, Li joked she considered retirement just days into their off-season training in November, during which she was doing up to six hours of training, split between fitness and tennis.

'After three days I was really tired. I [called] my husband, I say, I really want to retire,' she smiled.

Li famously broke free of China's rigidly controlled sports system in 2008, winning the right to choose her own coach and decide for herself which competitions to enter. At the end of 2010, she promoted her husband to coach, fired him a few months later, then went on to win the 2011 French Open.

The Wuhan resident's semifinal opponent will most likely be Russian second seed Maria Sharapova, who, along with Serena Williams, has the opportunity this week to dethrone Belarusian Victoria Azarenka from the top of the world rankings.

Li trails Sharapova 4-8 in head-to-head meetings, including the most recent three in 2012.

'She's [a] more aggressiveplayer on the court,' Li said when asked how Sharapova has improved since they last met in March last year. 'Should be [a] tough match,' added the sixth seed, who shares IMG tennis agent Max Eisenbud with Sharapova.