The singles competition of the 2018 Ladies Championship Gstaad tennis tournament was held in Gstaad, Switzerland from 16-22 July 2018. Kiki Bertens was the defending champion, but withdrew before the tournament began.

Alizé Cornet won the title, defeating Mandy Minella in the final, 6–4, 7–6^(8–6).

This was the last tournament, that former World No. 4 Francesca Schiavone had participated in. She drew her old rival Samantha Stosur in the first round and was defeated.

	Semifinals							Final
	1	Alizé Cornet	77	1
		Eugenie Bouchard	65	0r
								1	Alizé Cornet	6	78
								PR	Mandy Minella	4	66
		Markéta Vondroušová	6	2	2
	PR	Mandy Minella	4	6	6

	First round							Second round							Quarterfinals							Semifinals
	1	A Cornet	6	6
	Q	S Soler Espinosa	2	2				1	A Cornet	6	6
	PR	S Zheng	1	6	5			Q	C Perrin	3	3
	Q	C Perrin	6	4	7										1	A Cornet	6	77
	Q	K von Deichmann	6	2	3										5	S Stosur	4	62
	WC	P Schnyder	4	6	6			WC	P Schnyder	4	1
	WC	F Schiavone	3	2				5	S Stosur	6	6
	5	S Stosur	6	6																		1	A Cornet	77	1
	3	V Kužmová	6	7																			E Bouchard	65	0r
	Q	M Trevisan	2	5				3	V Kužmová	64	65
		J Teichmann	4	6	2			Q	V Kudermetova	77	77
	Q	V Kudermetova	6	1	6										Q	V Kudermetova	5	0
		E Bouchard	4	77	6											E Bouchard	7	6
		T Bacsinszky	6	61	4				E Bouchard	77	79
		A Lottner	3	2				8	V Golubic	62	67
	8	V Golubic	6	6

	First round							Second round							Quarterfinals							Semifinals
	6	L Arruabarrena	3	3
		M Vondroušová	6	6					M Vondroušová	6	6
		E Kostova	6	0	6				E Kostova	4	4
		A Kalinskaya	4	6	2											M Vondroušová	6	6
		N Vikhlyantseva	4	6	2											E Rodina	2	3
		M Barthel	6	3	6				M Barthel	4	6	5
		E Rodina	63	6	713				E Rodina	6	2	7
	4	C Witthöft	77	4	611																		M Vondroušová	6	2	2
	7	S Vögele	2	0																		PR	M Minella	4	6	6
		T Korpatsch	6	6					T Korpatsch	2	2
		S Sorribes Tormo	77	6					S Sorribes Tormo	6	6
	Q	V Ivakhnenko	65	1												S Sorribes Tormo	1	2
	PR	M Minella	6	77											PR	M Minella	6	6
		T Martincová	3	63				PR	M Minella	6	6
	WC	L Küng	4	1				2	J Larsson	3	4
	2	J Larsson	6	6

	First round							Qualifying competition
	1	Veronika Kudermetova	6	6
	WC	Quirine Lemoine	2	2
								1	Veronika Kudermetova	68	6	6
								8	Jessica Pieri	710	1	2
	WC	Diana Mihail	0	1
	8	Jessica Pieri	6	6

	First round							Qualifying competition
	2	Conny Perrin	6	6
		Yana Sizikova	4	4
								2	Conny Perrin	6	6
									Alexa Guarachi	4	0
		Alexa Guarachi	4	6	6
	11	Julia Grabher	6	1	1

	First round							Qualifying competition
	3	Kathinka von Deichmann	6	6
		Diāna Marcinkēviča	4	3
								3	Kathinka von Deichmann	6	6
								WC	Zoe Kruger	1	1
	WC	Zoe Kruger	7	6
	7	Deniz Khazaniuk	5	3

	First round							Qualifying competition
	4	Valentyna Ivakhnenko	6	6
		Aleksandrina Naydenova	1	0
								4	Valentyna Ivakhnenko	6	6
								12	Allie Kiick	1	2
		Gréta Arn	2	2
	12	Allie Kiick	6	6

	First round							Qualifying competition
	5	Martina Trevisan	4	78	6
		Katarzyna Piter	6	66	3
								5	Martina Trevisan	6	6
								10	Amandine Hesse	3	4
		Tess Sugnaux	2	2
	10	Amandine Hesse	6	6

	First round							Qualifying competition
	6	Sílvia Soler Espinosa	4	6	6
		Chloé Paquet	6	3	0
								6	Sílvia Soler Espinosa	6	6
								9	Barbara Haas	1	1
	WC	Xenia Knoll	6	3	3
	9	Barbara Haas	4	6	6

• Main Draw
• Qualifying Draw