Singles
2018 Tiburon Challenger
Champion	Michael Mmoh
Runner-up	Marcel Granollers
Score	6–3, 7–5

Cameron Norrie was the defending champion but chose not to defend his title.

Michael Mmoh won the title after defeating Marcel Granollers 6–3, 7–5 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Marcel Granollers	6	6
	6	Noah Rubin	2	2
								1	Marcel Granollers	3	5
								5	Michael Mmoh	6	7
	5	Michael Mmoh	6	3	6
	Alt	James Duckworth	3	6	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	M Granollers	6	7
		E King	2	5				1	M Granollers	6	7
	Q	C İlkel	4	6	6			Q	C İlkel	2	5
		L Miedler	6	4	3										1	M Granollers	6	6
		J-P Smith	6	6												J-P Smith	2	3
		P Martínez	4	2					J-P Smith	1	6	6
		P Krstin	0	3				8	B Fratangelo	6	4	2
	8	B Fratangelo	6	6																		1	M Granollers	6	6
	3	P Polansky	6	6																		6	N Rubin	2	2
	WC	T Fawcett	4	4				3	P Polansky	3	3
		C Eubanks	77	77					C Eubanks	6	6
		R Quiroz	64	64												C Eubanks	4	3
		J Clarke	2	65											6	N Rubin	6	6
	WC	JC Aragone	6	77				WC	JC Aragone	63	4
		T de Bakker	0	0				6	N Rubin	77	6
	6	N Rubin	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	M Mmoh	6	6
		D King	2	4				5	M Mmoh	6	3
		E Escobedo	6	77					E Escobedo	2	0r
	Q	R Ortega Olmedo	1	62											5	M Mmoh	79	2	6
	WC	B Holt	6	77											WC	T Paul	67	6	3
	Q	S Diez	3	64				WC	B Holt	0r
	WC	T Paul	6	6				WC	T Paul	5
	4	H Laaksonen	4	3																		5	M Mmoh	6	3	6
	7	M Polmans	4	4																		Alt	J Duckworth	3	6	3
		A Popyrin	6	6					A Popyrin	6	62	66
	Q	A Sarkissian	61	4				Alt	J Duckworth	4	77	78
	Alt	J Duckworth	77	6											Alt	J Duckworth	7	6
	SE	M Torpegaard	6	6												M Arévalo	5	3
		M Banes	4	2				SE	M Torpegaard	3	6	3
		M Arévalo	2	77	77				M Arévalo	6	0	6
	2	J Thompson	6	62	65

References

• Main draw
• Qualifying draw