Martina Navrátilová is considered to be one of the greatest, if not the greatest woman's player of all time. At 5' 8" in height, she is above average (for a woman) in this regard. But one opponent who has given her a lot of trouble over the years (when not her doubles partner) is Pam Shriver, who is much taller, at 6'0". Perhaps Shriver has advantages such as arm reach or power that Navrátilová lacks, partly compensating for Navrátilová's greater raw talent.
Another small, scrappy men's player is Michael Chang, who was the youngest man to win the French open. Great things were predicted of him, but he lost other Grand Slam finals to men like Boris Becker, Patrick Rafter and Thomas Muster who are much taller than Chang's 5'8".
Are the setbacks of Chang (and to a lesser extent Navrátilová) attributable to "size" (or lack thereof), or to other non-size factors such as skill, stamina, strategy, etc.? Did anyone "smaller" than Pam Shriver do better against Navrátilová in match play? Was Chang ever beaten by anyone close to his size (5'9" or shorter), or were all his defeats to much bigger men?