Rainer Schüttler defeated Tim Henman 6–4, 5–7, 6–1 to win the 1999 Qatar Open singles competition. Petr Korda was the defending champion.

	Semifinals							Final
	1	Tim Henman	6	6
	WC	Karim Alami	4	2
								1	Tim Henman	4	7	1
								Q	Rainer Schüttler	6	5	6
	Q	Rainer Schüttler	3	6	7
	7	Cédric Pioline	6	2	5

	First round							Second round							Quarterfinals							Semifinals
	1	T Henman	6	6
		S Schalken	2	3				1	T Henman	4	6	6
		F Santoro	4	1					Y El Aynaoui	6	3	0
		Y El Aynaoui	6	6											1	T Henman	6	613	6
		D Sanguinetti	1	2												J Tarango	4	715	4
		F Vicente	6	6					F Vicente	3	5
		J Tarango	6	6					J Tarango	6	7
	8	J Siemerink	3	3																		1	T Henman	6	6
	3	Y Kafelnikov	2	6	6																	WC	K Alami	4	2
	Q	S Huet	6	3	4			3	Y Kafelnikov	6	1	610
		M Safin	6	3	65				H Arazi	3	6	712
		H Arazi	1	6	77											H Arazi	1	77	4
		F Squillari	2	6	6										WC	K Alami	6	63	6
		B Ulihrach	6	1	4				F Squillari	2	77	5
	WC	K Alami	77	2	6			WC	K Alami	6	62	7
	5	P Korda	65	6	3

	First round							Second round							Quarterfinals							Semifinals
	6	T Johansson	1	2
		D Vacek	6	6					D Vacek	63	3
	Q	R Schüttler	4	6	6			Q	R Schüttler	77	6
		A Medvedev	6	3	2										Q	R Schüttler	6	65	6
		F Dewulf	1	63											4	G Ivanišević	2	77	2
	Q	C van Garsse	6	77				Q	C van Garsse	3	0
		F Clavet	3	77	4			4	G Ivanišević	6	6
	4	G Ivanišević	6	61	6																	Q	R Schüttler	3	6	7
	7	C Pioline	6	6																		7	C Pioline	6	2	5
		J Marín	3	1				7	C Pioline	77	6
	WC	J Sánchez	6	6				WC	J Sánchez	62	2
	Q	K Carlsen	3	4											7	C Pioline	77	6
		C Costa	3	4												M Zabaleta	62	2
		M Zabaleta	6	6					M Zabaleta	6	3	7
	WC	B Karbacher	4	77	6			WC	B Karbacher	0	6	5
	2	G Rusedski	6	63	3

• 1999 Qatar Open Singles Draw
• 1999 Qatar Open Singles Qualifying Draw