Wilson More Win: Del Potro Facebook Contest Winner uses her Cirrus One BLX to hit with her favorite player. Check out the Wilson Racquets at: http://www.wilson.com/en-us/tennis/rackets/. The most powerful tennis racket in the BLX line, as light as the wispy cloud it is named after, BLX feel, forgiving 118" headsize and the hybrid comfort between power, lightweight and comfort.