Juan Martin del Potro says he only has two of his older-generation Wilson racquets left, and while he has been testing new frames, he is hoping he doesn't break his remaining sticks in the next few weeks.

The Argentine is currently playing the Sydney International and will play the Australian Open next week.

“I was close to change, but I'm not feeling 100 percent at the moment,” said del Potro, who joked that if he does break both racquets in Melbourne, he will ask fellow Wilson player Roger Federer to borrow one. “Hopefully me and Wilson, we want to change, [we are] really close and really soon. I need to change racquets because I use [the same racquet] a lot. I think the other guys, they have advantage to me when they play with six or eight racquets in one match.”

Del Potro, who uses the same Wilson KFactor racquets he used in winning the 2009 U.S. Open, had just four racquets remaining at the 2012 U.S. Open, as was revealed to TENNIS.com.

“We are working really hard to find a good racquet for me. I mean, if I change the racquet during the off-season, then I came here to play a Grand Slam and I don't feel 100 percent. Your mind start to working in the negative position. It's not easy for the players change the racquet. But I'm proud to have Wilson behind me, because I know they are working really hard.”

WATCH: Juan Martin del Potro's racquet gets stencil treatment at the 2012 U.S. Open: