World number two Rafael Nadal expects to be fit for next week's Australian Open despite pulling out of a warm-up event in Sydney with a groin injury.
The Spaniard trailed Chris Guccione 6-5 in the first set of their first-round match at the Sydney International when he decided he could not continue.
"I will have some treatment on it Wednesday and will hope to be 100% fit for next week," said Nadal.
"I'm going to play for sure. I hope in two more days I will be 100%."
The 20-year-old missed last year's Australian Open with a foot injury.
French Open champion Nadal lost in the semi-finals in last week's Chennai Open in India amid unconfirmed reports that he was suffering an injury.
The world number two required medical treatment twice in his match against Guccione before conceding the match.
Defending champion James Blake needed just 46 minutes to beat fellow American Kevin Kim 6-3 6-4 in the opening round.