The top seed, who is playing the ATP 250 clay event at altitude for the first time since he won it in 2004, will on Thursday play his opening match after a bye against either German Daniel Brands or longtime friend Marco Chiudinelli.
Federer began testing a larger 98-square-inch racquet last week in Hamburg, reaching the semi-finals before losing to number 114 Argentine qualifier Federico Delbonis. He said he needs more time and matches to make a final decision on the prototype model.
"So far, I'm happy with this change. But I need many hours on the court to see if this is a good decision," said the 17-time grand slam champion.
"I haven't yet taken the decision on whether to use it in the US (he begins his pre-US Open campaign in a fortnight at the Montreal Masters). I still need to think it over,” he added.


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