Defending two-time champion Viktor Troicki, second seed Pablo Cuevas and Philipp Kohlschreiber all reached the quarter-finals of the Sydney International on Wednesday.
Serbian third seed Troicki, who won the event in 2015 and 2016, had few problems beating Paolo Lorenzi of Italy 6-3, 6-4 to set up a meeting against German fifth seed Kohlschreiber next.
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The only break of serve in the first set happened when Troicki claimed the Italian's serve in the fourth game as he went on to win the opener 6-3.
In the second set, the only break happened in the seventh game as the Serb went on to wrap up the set and match 6-4. His opponent in the quarter-finals, Kohlschreiber, defeated Australia's Jordan Thompson 7-5, 6-4 earlier in the day.
In some other second round result's, Uruguayan second seed Pablo Cuevas needed three sets to get past unseeded Frenchman Nicolas Mahut 6-4, 2-6, 6-2 while, in an upset, unseeded Brit Daniel Evans beat eighth seed Marcel Granollers of Spain 1-6, 6-3, 6-3.
Russia's Andrey Kuznetsov got through to the next round when Alex De Minaur of Australia was forced to retire injured with the score at 6-2, 0-0 in favour of the Russian.
Fourth seed Pablo Carreno of Spain needed two hours and 12 minutes to down Germany's Mischa Zverev 3-6, 7-6(4), 6-3 while sixth seed Gilles Muller from Luxembourg stayed on track by beating Australian hometown favourite Matthew Barton 6-1, 3-6, 6-4.