Almagro faces Spanish 'derby'
Nicolas Almagro will face fellow Spaniard David Ferrer in the last eight of the Australian Open after he advanced when Janko Tipsarevic had to withdraw through injury.
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Serbian Tipsarevic won his previous two matches - against Lukas Lacko and Julien Benneteau - in five sets but was trailing 6-2 5-1 when he pulled out with a jarred heel.
Almagro said: "That's not the way you want to win. But that's sport.
"Sometimes you can't do your best and you need to stop. I think he made the best decision."
Almagro, seeded number 10, has lost all 12 of his previous matches with Ferrer but is hoping to buck that trend and reach his first grand slam semi-final.
"It will be a good fight. I know him and he knows me," he said.
"It is a big opportunity for me to be in a semi-final. I'm ready to fight. I'm healthy and happy with my tennis.
"I think I'm playing really well and we'll see what will happen on Tuesday."