Arthur Ashe defeated Dick Crealy in the final, 6–4, 9–7, 6–2 to win the men's singles tennis title at the 1970 Australian Open. It was his second major singles title.

Rod Laver was the reigning champion, but chose not to compete this year. The first round was best-of-three sets, and the rest of the tournament was best-of-five.

All seeds receive a bye into the second round.

	Quarterfinals									Semifinals									Final
	1	Tony Roche	7	5	5
	8	Roger Taylor	9	7	7
										8	Roger Taylor	4	11	3	6	6
										12	Dick Crealy	6	9	6	4	8
	3	Tom Okker	1	6	6	5	3
	12	Dick Crealy	6	3	4	7	6
																			12	Dick Crealy	4	7	2
																			4	Arthur Ashe	6	9	6
	10	Ray Ruffels	8	3	4	2
	4	Arthur Ashe	6	6	6	6
										4	Arthur Ashe	6	8	6	2
										6	Dennis Ralston	3	10	3	1	r
	6	Dennis Ralston	19	20	4	6
	2	John Newcombe	17	18	6	3

	First round							Second round									Third round									Quarterfinals
								1	T Roche	8	11	6
		J Cooper							J Cooper	6	9	4
		R Wilson	w/o														1	T Roche	6	6	6
		J Kukal	6	12													15	G Battrick	2	2	4
		A Hammond	4	10					J Kukal	6	3	6	0	4
								15	G Battrick	2	6	2	6	6
																										1	T Roche	7	5	5
																										8	R Taylor	9	7	7
								8	R Taylor	6	6	6
		G Pollard	5	4					L Schloss	4	3	4
		L Schloss	7	6													8	R Taylor	1	2	6	12	6
		M Anderson	w/o														9	R Lutz	6	6	4	10	3
		M Werren							M Werren	1	3	1
								9	R Lutz	6	6	6

	First round							Second round									Third round									Quarterfinals
								3	T Okker	6	6	7
		A McDonald	5	4					K Stuart	4	2	5
		K Stuart	7	6													3	T Okker	7	10	10	4	6
		A Shapter	6	4													14	J Alexander	5	8	12	6	4
		R Keldie	8	6					R Keldie	3	1	r
								14	J Alexander	6	2
																										3	T Okker	1	6	6	5	3
																										12	D Crealy	6	3	4	7	6
								12	D Crealy	6	10	12
		A Gardiner							A Gardiner	4	8	10
		R Russell	w/o														12	D Crealy	6	6	14
		P Doerner	7	6	4												5	S Smith	4	4	12
		J Brown	9	0	6				J Brown	1	6	4
								5	S Smith	6	8	6

	First round							Second round									Third round									Quarterfinals
								7	N Pilić	6	13	9	3	6
		T Gorman	6	6					T Gorman	3	11	11	6	1
		S Ball	1	1													7	N Pilić	5	4	7	5
		B Phillips-Moore	6	8	6												10	R Ruffels	7	6	5	7
		C Dibley	3	10	4				B Phillips-Moore	6	4	6	5
								10	R Ruffels	8	6	1	7
																										10	R Ruffels	8	3	4	2
																										4	A Ashe	6	6	6	6
								13	W Bowrey	6	1	6	4	7
		F Sedgman	6	3	6				F Sedgman	2	6	3	6	5
		B Paul	4	6	3												13	W Bowrey	3	7	4
		G Masters	6	7													4	A Ashe	6	9	6
		K Coombes	4	5					G Masters	15	2	3
								4	A Ashe	17	6	6

	First round							Second round									Third round									Quarterfinals
								6	D Ralston	6	6	4	6
		J Bartlett	19	3	2				V Zedník	3	3	6	4
		V Zedník	17	6	6												6	D Ralston	6	6	6
		J McManus	6	7	3												11	A Stone	2	3	2
		B Giltinan	4	9	6				B Giltinan	5	3	6	1
								11	A Stone	7	6	3	6
																										6	D Ralston	19	20	4	6
																										2	J Newcombe	17	18	6	3
								16	B Carmichael	1	r
		P Dent	6	6					P Dent	2
		R Brent	4	3														P Dent	2	3	3
		I Bidmeade	w/o														2	J Newcombe	6	6	6
		E Neely							E Neely	1	5	1
								2	J Newcombe	6	7	6

• Association of Tennis Professionals (ATP) – 1970 Australian Open Men's Singles draw
• 1970 Australian Open – Men's draws and results at the International Tennis Federation