1977 Australian Open (December) – Men's singles

Vitas Gerulaitis defeated John Lloyd in the final, 6–3, 7–6, 5–7, 3–6, 6–2 to win the December edition of the men's singles tennis tournament at the 1977 Australian Open.

Roscoe Tanner was the defending champion, but lost in the first round to Chris Lewis.

Seeds
The seeded players are listed below. Vitas Gerulaitis is the champion; others show the round in which they were eliminated.


 * 1)  🇺🇸 Vitas Gerulaitis (champion)
 * 2)  🇺🇸 Roscoe Tanner (first round)
 * 3)  🇦🇺 Tony Roche (first round)
 * 4)  🇦🇺 Ken Rosewall (quarterfinals)
 * 5)  🇦🇺 Phil Dent (second round)
 * 6)  🇦🇺 John Alexander (semifinals)
 * 7)  🇺🇸 Stan Smith (third round)
 * 8)  🇺🇸 Tim Gullikson (third round)

Key

 * Q = Qualifier
 * WC = Wild card
 * LL = Lucky loser
 * r = Retired