Men's Grand Slam titles without losing a set in the Open era (1968-present):

Rafael Nadal, 2008 French Open

R. Federer, 2007 Australian Open

Bjorn Borg, 1980 French Open

Bjorn Borg, 1978 French Open

Bjorn Borg, 1976 Wimbledon

Ilie Nastase, 1973 French Open (first two matches were best-of-3)

Ken Rosewall, 1971 Australian Open (five matches)