Chris Lewis defeated Wally Masur 7–5, 6–0, 2–6, 6–4 to win the 1985 Benson and Hedges Open singles competition. Danny Saltz was the defending champion.

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

• Q - Qualifier
• NB: The Final was the best of 5 sets while all other rounds were the best of 3 sets.

	Final
	8	Wally Masur	5	0	6	4
	7	Chris Lewis	7	6	2	6

	First round							Second round							Quarterfinals							Semifinals
	1	J Fitzgerald	2	6	6
		K Belcher	6	3	4			1	J Fitzgerald	6	4	6
		M Wooldridge	6	4	3				K Meiler	0	6	1
		K Meiler	2	6	6										1	J Fitzgerald	7	7
		H Sands	3	6	6										5	B Drewett	6	5
		J Canter	6	3	4				H Sands	4	4
	Q	R Barlow	6	2	3			5	B Drewett	6	6
	5	B Drewett	2	6	6																	1	J Fitzgerald	7	5	5
	3	L Shiras	3	6	8																	8	W Masur	5	7	7
		D Lewis	6	2	6			3	L Shiras	7	3	3
		M Long	2	1					K Evernden	6	6	6
		K Evernden	6	6												K Evernden	4	6	7
		J Smith	7	0	3										8	W Masur	6	2	9
		B Dyke	6	6	6				B Dyke	4	1
		D Mustard	6	3	3			8	W Masur	6	6
	8	W Masur	4	6	6

	First round							Second round							Quarterfinals							Semifinals
	6	P Doohan	6	6
		B Derlin	2	2				6	P Doohan	6	6
		C Miller	6	6					C Miller	3	4
	Q	M Fancutt	2	1											6	P Doohan	4	6	4
	Q	R Akel	6	3	4											D Saltz	6	4	6
		J Turpin	4	6	6				J Turpin	6	4	3
		D Saltz	7	6					D Saltz	4	6	6
	4	D Cassidy	5	3																			D Saltz	6	6
	7	C Lewis	6	6																		7	C Lewis	7	7
		S Guy	4	1				7	C Lewis	6	6
		S McCain	6	7					S McCain	1	4
	Q	C Stansbury	4	5											7	C Lewis	7	6
		G Layendecker	2	6	9											G Layendecker	5	3
		P Johnston	6	1	7				G Layendecker	6	7
		B Levine	2	2				2	J Lloyd	4	6
	2	J Lloyd	6	6

• Association of Tennis Professional (ATP) – 1985 Men's Singles draw