Originally Posted by BreakPoint
Del Potro never used a K-Factor. It's a paintjob. He uses the old ProStaff 6.1 Classic underneath the paintjob. A racquet which came out in 1991. Wilson hasn't made them in a very, very long time, which is probably why Del Potro can't get any more.
And i have always wondered why his racket doesn't look quite the same as K-factors Fed used (not saying that they weren't paintjobs either)...