Singles
1998 Porsche Tennis Grand Prix
Final
Champion	Sandrine Testud
Runner-up	Lindsay Davenport
Score	7–5, 6–3
Details
Draw	28 (3WC / 4Q)
Seeds	8
Events
Singles Doubles
← 1997 · Porsche Tennis Grand Prix · 1999 →

Martina Hingis was the defending champion, but lost in the quarterfinals to Dominique Van Roost.

Sandrine Testud won the title, defeating Lindsay Davenport in the final 7–5, 6–3.

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. The top four seeds received a bye to the second round.

	Semifinals							Final
	WC	Dominique Van Roost	2	0
		Sandrine Testud	6	6
									Sandrine Testud	7	6
								2	Lindsay Davenport	5	3
	4	Arantxa Sánchez Vicario	6	4
	2	Lindsay Davenport	7	6

	First round							Second round							Quarterfinals							Semifinals
								1	M Hingis	1	6	6
		A Kournikova	1	6	7				A Kournikova	6	2	2
	Q	B Schett	6	4	6										1	M Hingis	3	7	4
		M Serna	6	5	2										WC	D Van Roost	6	6	6
	WC	D Van Roost	2	7	6			WC	D Van Roost	6	6
		S Farina	2	6	3			5	V Williams	1	2
	5	V Williams	6	4	6																	WC	D Van Roost	2	0
																							S Testud	6	6
								3	J Novotná	6	3	0/r
	Q	K Hrdličková	6	6	0				S Williams	2	6	2
		S Williams	7	3	6											S Williams	3	6	1
		S Testud	5	6	6											S Testud	6	1	6
		E Likhovtseva	7	1	0				S Testud	6	4	6
		A Huber	6	6					A Huber	2	6	2
	8	P Schnyder	4	1

	First round							Second round							Quarterfinals							Semifinals
	WC/6	C Martínez	3	6	6
		I Spîrlea	6	2	2			WC/6	C Martínez	4	6	2
		L Raymond	3	6	6				L Raymond	6	2	6
		R Dragomir	6	2	4											L Raymond	6	5	2
	Q	A Mauresmo	6	6											4	A Sánchez Vicario	1	7	6
	WC	A Glass	2	1				Q	A Mauresmo	3	2
								4	A Sánchez Vicario	6	6
																						4	A Sánchez Vicario	6	4
	7	N Tauziat	6	6	6																	2	L Davenport	7	6
		K Po	4	7	2			7	N Tauziat	6	6
		N Zvereva	6	6					N Zvereva	3	3
	Q	J Kandarr	3	2											7	N Tauziat	6	5
		M Pierce	6	6											2	L Davenport	7	7
		A Coetzer	2	2					M Pierce	1	3
								2	L Davenport	6	6

• 1998 Porsche Tennis Grand Prix Draw