Ferrer tested in opener
Top seed David Ferrer began his bid for a third straight Copa Claro title in Buenos Aires with a straight-sets win over Argentinian Maximo Gonzalez.
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But it was far from straightforward for the Spaniard, playing his first match since the Australian Open quarter-finals, as he needed just over two hours for his 7-6 (9/7) 6-4 victory.
Both players lost their serve twice during the mammoth first set before the tense tie-breaker. Gonzalez survived three set points before the Spaniard took the set.
The 31-year-old Ferrer then broke twice in the second set before serving out the match.
Meanwhile, sixth seed Robin Haase was pushed hard by another Argentine, Martin Alund.
Haase's 6-4 6-7 (6/8) 6-3 win saw a comeback by Alund in the second set when he won the tie-break. But the Dutch player proved too strong for Alund in the third set, breaking his serve at a crucial moment.
Seventh seed Juan Monaco lost to Albert Ramos 6-7 (3/7) 6-4 6-2 but there was one home winner with last week's Vina Del Mar finalist Leonardo Mayer beating compatriot Facundo Arguello 6-3 6-4.
Second seed Fabio Fognini, the man who beat Mayer to win in Chile last week, eased into the last 16 with a 7-5 6-2 win over Julian Reister.
There were also wins for Santiago Giraldo and Filippo Volandri on Tuesday.