Singles
2009 Siemens Open
Champion	Kristof Vliegen
Runner-up	Albert Montañés
Score	4–2, RET.

Jesse Huta Galung was the title defender, but he lost to Pablo Cuevas already in the first round.
Kristof Vliegen became the new champion, after retired Albert Montañés in the final.

Seeds

Draw

Final four

	Semifinals							Final
	1	Albert Montañés	6	3	6
	3	Steve Darcis	4	6	1
								1	Albert Montañés	2r
								5	Kristof Vliegen	4
	5	Kristof Vliegen	6	3	6
		Pablo Cuevas	3	6	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Montañés	7	6
		D Muñoz-De La Nava	5	4				1	A Montañés	6	7
		J-P Amado	3	6	1			Q	G Kretschmer	1	63
	Q	G Kretschmer	6	3	6										1	A Montañés	5
		J Sirianni	7	4	3										6	D Köllerer	2r
		T de Bakker	610	6	6				T de Bakker	6	1	1
	Q	F Prpic	2	4				6	D Köllerer	2	6	6
	6	D Köllerer	6	6																		1	A Montañés	6	3
	3	S Darcis	6	6																		3	S Darcis	4	6	1
		L Recouderc	4	3				3	S Darcis	4	7	7
		Y Mertens	61	3					J Vaněk	6	63	62
		J Vaněk	7	6											3	S Darcis	7	2	6
		JI Chela	6	6												JI Chela	5	6	2
	Q	A Gensse	3	2					JI Chela	64	6	7
	WC	T Schoorel	4	4				8	S Greul	7	3	5
	8	S Greul	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	K Vliegen	6	6
		P Luczak	3	3				5	K Vliegen	7	7
	WC	S Fransen	6	4				WC	S Fransen	5	5
		P Riba	1	1r											5	K Vliegen	4	6	6
	LL	A Vejmělka	7	4	2											T Tenconi	6	4	2
		T Tenconi	65	6	6				T Tenconi	6	7
		J Reister	3	6	2			4	J Benneteau	3	5
	4	J Benneteau	6	4	6																	5	K Vliegen	6	3	6
	7	D Gimeno-Traver	6	5	6																		P Cuevas	3	6	3
		JP Brzezicki	3	7	2			7	D Gimeno-Traver	62	6	4
		J Huta Galung	5	3					P Cuevas	7	4	6
		P Cuevas	7	6												P Cuevas	6	6
		L Rosol	4	2											WC	R Sluiter	4	2
	Q	R Junaid	6	6				Q	R Junaid	1	5
	WC	R Sluiter	6	6				WC	R Sluiter	6	7
	2	M González	3	4

References

• Main Draw
• Qualifying Draw