(FILES) In this photograph taken on January 17, 2015, Juan Martin Del Potro of Argentina hits a backhand volley during a practice session ahead of the Australian Open tennis tournament in Melbourne. Grand Slam winner Juan Martin del Potro on January 18, 2015, has pulled out of the Australian Open after a recurrence of his troublesome wrist injury. The giant Argentine spent almost a year on the sidelines before making his return at the Sydney International last week. AFP PHOTO/William WEST/FILES –IMAGE RESTRICTED TO EDITORIAL USE – STRICTLY NO COMMERCIAL USE