The 1999 German Open was a tennis tournament played on outdoor clay courts. It was the 92nd edition of the Hamburg Masters (German Open), and was part of the ATP Super 9 of the 1999 ATP Tour. It took place at the Rothenbaum Tennis Center in Hamburg, Germany, from through 3 May through 10 May 1999.

Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.

	Semifinals							Final[1]
		Wayne Arthurs Andrew Kratzmann	6	6
	3	Ellis Ferreira Rick Leach	4	4
									Wayne Arthurs Andrew Kratzmann	2	77	6
									Paul Haarhuis Jared Palmer	6	65	2
	4	Olivier Delaître Fabrice Santoro	6	3	4
		Paul Haarhuis Jared Palmer	3	6	6

	First round							Second round							Quarterfinals							Semifinals
								1	M Bhupathi L Paes
		Á López Morón D Sanguinetti	6	6					Á López Morón D Sanguinetti	w/o
		P Nyborg P Tramacchi	3	4												Á López Morón D Sanguinetti	3	2
		W Arthurs A Kratzmann	6	5	6											W Arthurs A Kratzmann	6	6
		W Ferreira J Sánchez	3	7	4				W Arthurs A Kratzmann	7	6
	8	D Adams J-L de Jager	6	6	6			8	D Adams J-L de Jager	6	4
		G Kuerten N Lapentti	3	7	4																		W Arthurs A Kratzmann	6	6
																						3	E Ferreira R Leach	4	4
									P Albano T Carbonell	6	2
		P Albano T Carbonell	7	6				3	E Ferreira R Leach	7	6
		R Reneberg J Stark	5	2											3	E Ferreira R Leach	6	6
		F Meligeni F Montana	6	4	7										5	J Novák D Rikl	3	4
		T Henman G Rusedski	2	6	5				F Meligeni F Montana	2	1
	5	J Novák D Rikl	6	6				5	J Novák D Rikl	6	6
		M Barnard D Orsanic	2	2

	First round							Second round							Quarterfinals							Semifinals
	6	A Florent D Vacek	6	7
		C Haggard A Olhovskiy	3	6				6	A Florent D Vacek	7	7
		L Burgsmüller H Dreekmann	7	6					L Burgsmüller H Dreekmann	6	5
		N Broad R Koenig	6	4											6	A Florent D Vacek	6	6	4
		P Norval C Suk	7	6											4	O Delaître F Santoro	4	7	6
		T Ketola A Kitinov	5	3					P Norval C Suk	4	6
								4	O Delaître F Santoro	6	7
																						4	O Delaître F Santoro	6	3	4
	7	Donald Johnson Cyril Suk	6	4	6																		P Haarhuis J Palmer	3	6	6
		M Kohlmann D Prinosil	4	6	4			7	D Johnson C Suk	6	6
		P Haarhuis J Palmer	6	7					P Haarhuis J Palmer	7	7
		J Grabb D Macpherson	2	5												P Haarhuis J Palmer	6	7
		J Knippschild R Schüttler	6	6											2	M Knowles D Nestor	4	5
		L Bale G Stafford	4	1					J Knippschild R Schüttler	2	5
								2	M Knowles D Nestor	6	7