Since the birth of the Open Era in 1968, tennis has seen a complete revitalization of how players compete; the material of the racquets, style of play, and improved fitness techniques all contribute to the explosion of quality that the sport has seen.
It's to the point where not even doubles has been spared from this epic "golden" period. These WTA pairings have shaken up the game since the turn of the century, becoming the best of the best of the best, and earning recognition.