Mixed doubles
1999 US Open
Final
Champions	Ai Sugiyama Mahesh Bhupathi
Runners-up	Kimberly Po Donald Johnson
Score	6–4, 6–4
Events
Singles men women boys girls Doubles men women mixed boys girls WC Singles men women quad WC Doubles men women quad Legends men women mixed
← 1998 · US Open · 2000 →

The 1999 US Open mixed doubles was the mixed doubles event of the hundred-and-ninth edition of the US Open, the fourth and last Grand Slam of the year. Serena Williams and Max Mirnyi were the defending champions but did not compete that year.

Ai Sugiyama and Mahesh Bhupathi won in the final against unseeded Americans Kimberly Po and Donald Johnson, 6–4, 6–4.

Seeds

Draw

Key

Final

	Semifinals							Final
		Kimberly Po Donald Johnson	6	6
	3	Rennae Stubbs Todd Woodbridge	4	4
									Kimberly Po Donald Johnson	4	4
								2	Ai Sugiyama Mahesh Bhupathi	6	6
	WC	Alexandra Stevenson Brian MacPhie	4	5
	2	Ai Sugiyama Mahesh Bhupathi	6	7

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	L Raymond L Paes	7	7
		L Horn K Ullyett	5	5				1	L Raymond L Paes	6	3	4
		K Po D Johnson	3	6	6				K Po D Johnson	4	6	6
		I Selyutina C Suk	6	3	4											K Po D Johnson	6	6
		P Tarabini T Carbonell	2	3											7	L Neiland R Leach	2	4
		I Spîrlea D Orsanic	6	6					I Spîrlea D Orsanic	4	3
		D Graham S Stolle	68	67				7	L Neiland R Leach	6	6
	7	L Neiland R Leach	710	79																			K Po D Johnson	6	6
	3	R Stubbs T Woodbridge	6	3	6																	3	R Stubbs T Woodbridge	4	4
		K Habšudová J Novák	3	6	2			3	R Stubbs T Woodbridge	6	77
		K Kunce E Ferreira	77	6					K Kunce E Ferreira	3	65
		C Vis D Rikl	65	3											3	R Stubbs T Woodbridge	6	6
		E Tatarkova A Olhovskiy	6	6												E Tatarkova A Olhovskiy	3	1
		K Srebotnik P Norval	4	3					E Tatarkova A Olhovskiy	6	6
		M Bollegraf P Albano	77	4	5			Alt	K-A Guse J Waite	4	2
	Alt	K-A Guse J Waite	65	6	7

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	E Likhovtseva M Knowles	2	3
	WC	A Stevenson B MacPhie	6	6				WC	A Stevenson B MacPhie	710	6
		C Black R Koenig	6	6					C Black R Koenig	68	1
		T Križan A Kratzmann	1	4											WC	A Stevenson B MacPhie	6	6
	WC	L Osterloh S Humphries	4	6	6										WC	L Osterloh S Humphries	2	4
		A-G Sidot O Delaître	6	3	2			WC	L Osterloh S Humphries	6	3	6
	WC	T Snyder C Mamiit	2	2				4	C Morariu J Palmer	3	6	1
	4	C Morariu J Palmer	6	6																		WC	A Stevenson B MacPhie	4	5
	8	M Pierce J-L de Jager	6	7																		2	A Sugiyama M Bhupathi	6	7
		L Wild D Macpherson	3	5				8	M Pierce J-L de Jager	7	77
		F Labat C Haggard	3	6	6				F Labat C Haggard	5	60
		P Suárez W Arthurs	6	3	4										8	M Pierce J-L de Jager	6	4	2
		R McQuillan A Florent	6	6											2	A Sugiyama M Bhupathi	4	6	6
	WC	K Schlukebir M Bryan	2	4					R McQuillan A Florent	1	r
		A Fusai M Damm	2	5				2	A Sugiyama M Bhupathi	4
	2	A Sugiyama M Bhupathi	6	7