Sports duo Björn Borg and John McEnroe have joined forces through the launch of a limited edition underwear collection set to drop Fall 2011 with portions of the revenue going towards the John and Patty McEnroe Foundation. The collection features four different underwear styles, two designed by each of the friendly rivals. The collection was inspired by the golden age of tennis, the era when the Wimbledon final between the two sports stars took place. The collection will also feature 100 pieces of underwear which are embellished with the real signatures of Borg and McEnroe.