Rosewall was razor sharp in that series, and won his first two five-set matches against a tough Laver with brilliant shot-making...in the third match at Kooyong, Laver unleashed a barrage of powerful winners in the fourth set to close out the match, and followed that up with a blaze of power to win a lop-sided match at Adelaide.
Here are the results of the best-of-five-set matches.
White City Rosewall df. Laver 6-3, 6-3, 6-3
Brisbane Rosewall df. Laver 3-6, 10-8, 6-2, 6-3
Kooyong Laver df. Rosewall 6-3, 3-6, 7-5, 6-2
Adelaide Laver df. Rosewall 6-1, 6-2, 6-2
As you can see, as Laver figured out Rosewall's game, his results improved.
I think that if they had met at Wimbledon, Laver would have won.