We talk a lot of Nadal's arms, but it's more Nadal's left arm that is big !!
Laver used to have trunk instead of his left forearm. However, lefties are not especially prone to have this difference in size, as Mc said he was the only one in his period to have arms of the same size. Do you have other examples of big arm differences ?
"I asked a bloke in the front row if he liked the serve-and-volley stuff," said Rafter. "He said he did but asked if he was going to get to see any rallies. 'Not today, mate,' I told him."