Singles
1998 Legg Mason Tennis Classic
Final
Champion	Andre Agassi[1]
Runner-up	Scott Draper
Score	6–2, 6–0
Details
Draw	56
Seeds	16
Events
Singles Doubles
← 1997 · Washington Open · 1999 →

The 1998 Legg Mason Tennis Classic was a men's tennis tournament played on outdoor hard courts in Washington, D.C., United States, that was part of the International Series Gold of the 1998 ATP Tour. It was the twenty-ninth edition of the tournament and was held 20 July – 26 July.

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

	Semifinals							Final[1]
	1	Michael Chang	w/o
	14	Scott Draper
								14	Scott Draper	2	0
								2	Andre Agassi	6	6
	3	Wayne Ferreira	1	0
	2	Andre Agassi	6	6

	First round							Second round							Third round							Quarterfinals
								1	M Chang	6	6
		M Sell	7	6					M Sell	2	3
		B Bryan	6	0											1	M Chang	6	6
		L Burgsmüller	7	6											15	M Damm	4	1
		C Caratti	6	1					L Burgsmüller	2	4
	15	M Damm	6	7				15	M Damm	6	6
		G Cañas	4	6																		1	M Chang	6	6
	10	A Ilie	6	5	6																	7	J Courier	3	4
		I Heuberger	4	7	3			10	A Ilie	7	3	1
		J Gimelstob	6	2	6				J Gimelstob	6	6	6
		L Hewitt	3	6	2											J Gimelstob	3	4
		M Ondruska	6	6											7	J Courier	6	6
		E Ran	4	0					M Ondruska	6	6
								7	J Courier	7	7

	First round							Second round							Third round							Quarterfinals
								4	B Black	4	6	6
		G Stafford	6	3	6				G Stafford	6	1	0
		M Tebbutt	4	6	3										4	B Black	2	4
		W Black	6	6											14	S Draper	6	6
		J van Lottum	3	3					W Black	6	3	6
	14	S Draper	6	3	6			14	S Draper	4	6	7
		A Hernández	3	6	4																	14	S Draper	6	6
	11	G Pozzi	4	6	6																	5	F Dewulf	3	2
		Ó Burrieza	6	4	0			11	G Pozzi	7	6
		A Sá	7	6					A Sá	6	;1
		T Ketola	6	4											11	G Pozzi	6	4
		S Sargsian	3	6	7										5	F Dewulf	7	6
		P Goldstein	6	4	5				S Sargsian	6	1
								5	F Dewulf	7	6

	First round							Second round							Third round							Quarterfinals
									V Spadea	6	6	6
		D Nainkin	6	7				6	D Nainkin	4	7	1
		S Stolle	2	6											6	V Spadea	7	6
		D Nargiso	6	6												D Nargiso	6	4
		O Motevassel	4	4					D Nargiso	6	6
		R Schüttler	4	6	6				R Schüttler	4	4
	12	J-M Gambill	6	3	3																	6	V Spadea	4	7	1
		D Caldwell	3	6	7																	3	W Ferreira	6	6	6
	13	K Carlsen	6	4	5				D Caldwell	3	7	6
		R Delgado	6	6					R Delgado	6	6	2
		S Campbell	3	2												D Caldwell	5	3
		J Arias	6	2											3	W Ferreira	7	6
		W McGuire	4	5R					J Arias	1	2
								3	W Ferreira	6	6

	First round							Second round							Third round							Quarterfinals
								8	S Schalken	6	4	3
		M Ruah	6	6	6				M Ruah	3	6	6
		P Harsanyi	0	7	2											M Ruah	4	3
		S Lareau	6	6												S Lareau	6	6
		S Humphries	4	4					S Lareau	7	6
	9	J Tarango	6	6				9	J Tarango	6	2
		J Van Herck	1	2																			S Lareau	1	2
		D Nestor	6	6																		2	A Agassi	6	6
	16	D Vacek	4	4					D Nestor	7	4	4
		C Van Garsse	6	6					C Van Garsse	6	6	6
		M Hadad	3	4												C Van Garsse	3	4
		D Wheaton	6	6											2	A Agassi	6	6
		P Tramacchi	3	3					D Wheaton	4	2
								2	A Agassi	6	6