Singles
1999 Sybase Open
Champion	Mark Philippoussis
Runner-up	Cecil Mamiit
Score	6–3, 6–2
Draw	32 (4Q / 3WC)
Seeds	8

Andre Agassi was the defending champion, but was defaulted in his second round match against Cecil Mamiit for swearing at a line judge.^[1]

Mark Philippoussis won the title, defeating Mamiit 6–3, 6–2 in the final.^[2]

Seeds

Draw

Finals

	Semifinals							Final
	1	Pete Sampras
	3	Mark Philippoussis	w/o
								3	Mark Philippoussis	6	6
								Q	Cecil Mamiit	3	2
	4	Michael Chang	6	3	4
	Q	Cecil Mamiit	3	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	P Sampras	6	6
		G Blanco	4	4				1	P Sampras	7	6
		M Rodríguez	6	62	6				M Rodríguez	5	3
	Q	A Hernández	4	77	3										1	P Sampras	7	6
	Q	B Karbacher	6	6											Q	B Karbacher	5	3
		S Koubek	3	2				Q	B Karbacher	6	65	6
		S Lareau	6	6					S Lareau	3	77	3
	7	M Zabeleta	2	1																		1	P Sampras
	3	M Philippoussis	62	7	6																	3	M Philippoussis	w/o
		S Sargsian	77	5	3			3	M Philippoussis	6	6
		J Courier	4	64					J van Lottum	2	1
		J van Lottum	6	77											3	M Philippoussis	6	3	77
	Q	R Agénor	6	2	3										WC	J Gimelstob	2	6	60
	WC	C Woodruff	2	6	6			WC	C Woodruff	4	63
	WC	J Gimelstob	6	78				WC	J Gimelstob	6	77
	6	J-M Gambill	3	66

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	M Puerta	2	6	3
		C Ruud	6	4	6				C Ruud	6	77
		C Costa	6	4	4			WC	P Goldstein	1	64
	WC	P Goldstein	4	6	6											C Ruud	1	5
		F Squillari	6	3	6										4	M Chang	6	7
		A Portas	1	6	2				F Squillari	4	65
		F Meligeni	3	2				4	M Chang	6	77
	4	M Chang	6	6																		4	M Chang	6	3	4
	8	R Delgado	5	6	7																	Q	C Mamiit	3	6	6
		B Steven	7	4	5			8	R Delgado	2	3
		S Campbell	3	6	5				M Woodforde	6	6
		M Woodforde	6	3	7											M Woodforde	65	6	3
	Q	C Mamiit	2	6	7										Q	C Mamiit	77	4	6
		K Carlsen	6	3	5			Q	C Mamiit	0	6
		T Woodbridge	2	1				2	A Agassi	6	6d
	2	A Agassi	6	6

References

• Main draw
• Qualifying draw