Juan Martin del Potro has beaten Radek Stepanek in three sets to reach the quarter-finals of the Sydney International.
After taking the first set 6-4, the Argentine was forced into a decider when the Czech levelled 6-3 in the second.
However, the 2009 US Open champion clinched the third set 6-3 after two hours and eight minutes on court, setting up a meeting with Denis Istomin in the last eight.
The Uzbek defeated Russia's Dmitry Tursunov 7-6[5] 6-2 to seal his progress.
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