Juan Martin del Potro made a brief comeback in Sydney last week and underwent another wrist surgery today.

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The 26-year-old Argentine underwent what his press rep called "minor surgery" on his left wrist at the at the Mayo Clinic in Rochester, Minn.

The surgery, conducted by a team led by Dr. Richard Berger, "was successful" del Potro's publicist said.  The 2009 U.S. Open champion is expected to begin rehabilitation in two weeks.

The 2014 Sydney champion launched his comeback last week, conceding his wrist was a concern. Del Potro defeated Sergiy Stakhovsky and Fabio Fognini to reach the quarterfinals, but looked spent in the latter stages of a 7-6 (5), 7-6 (3) loss to Mikhail Kukushkin.

Del Potro pulled out of the Australian Open on Sunday, saying Grand Slam competition could  "be dangerous" for his wrist.

“I didn't feel prepared for playing in this big event,” Del Potro said at a press conference last weekend. “My first Grand Slam after one year, five-set matches, is very tough. Could be dangerous for my wrist and also for my physic. I think it was a tough decision, but could be a smart decision if I want to stay healthy and play for the whole year.”

The right-handed del Potro has endured chronic injuries to both wrists. He beat both Rafael Nadal and Roger Federer to capture the 2009 U.S. Open title, but a right wrist injury limited him to just three tournaments in 2010. He had right wrist surgery in May and missed eight months.

Surgery on Del Potro's left wrist limited him to just four tournaments last season.