Boys' singles
2003 Australian Open
Champion	Marcos Baghdatis
Runner-up	Florin Mergea
Score	6–4, 6–4

Clément Morel was the defending champion, but did not compete in the Juniors in this year.

Marcos Baghdatis defeated Florin Mergea (6–4, 6–4) in the final.

Seeds

Draw

Finals

	Quarterfinals							Semifinals							Final
	1	Marcos Baghdatis	6	6
		Brendan Evans	2	2
								1	Marcos Baghdatis	6	711
								5	Jo-Wilfried Tsonga	4	69
		Eric Scherer	1	1
	5	Jo-Wilfried Tsonga	6	6
															1	Marcos Baghdatis	6	6
															6	Florin Mergea	4	4
	12	Phillip Simmonds	0	2
	4	Mathieu Montcourt	6	6
								4	Mathieu Montcourt	2	65
								6	Florin Mergea	6	77
	6	Florin Mergea	6	6
	14	Gaël Monfils	3	2

Top half

Section 1

	First round							Second round							Third round							Quarterfinals
	1	Marcos Baghdatis	7	6
		Fred Gil	5	3				1	M Baghdatis	4	6	6
		David North	7	5	1				L Rosol	6	1	2
		Lukáš Rosol	5	7	6										1	M Baghdatis	6	6
		Alexander Petropoulos	3	1												J Ouanna	4	3
		Josselin Ouanna	6	6					J Ouanna	6	6
		Brian Hung	6	0	1			13	J Chirico	2	4
	13	Jarrett Chirico	1	6	6																	1	M Baghdatis	6	6
	9	Scott Oudsema	3	2																			B Evans	2	2
		Guy Thomas	6	6					G Thomas	6	6
		Somdev Devvarman	5	6	6				S Devvarman	0	2
		Rick Schmidt	7	4	2											G Thomas	1	6	2
		Robert Smeets	3	3												B Evans	6	4	6
		Brendan Evans	6	6					B Evans	6	6
		Bernhard Deussner	7	6					B Deussner	1	2
	7	Adrian Ungur	5	4

Section 2

	First round							Second round							Third round							Quarterfinals
	3	Chris Kwon	3	2
	Q	Dejan Cvetkovic	6	6				Q	D Cvetkovic	3	64
		Eric Scherer	6	6					E Scherer	6	77
		Christopher Singh	4	3												E Scherer	63	6	6
	Q	Todd Ley	4	62											15	H Tecău	77	1	4
	Q	Woong-Sun Jun	6	77				Q	W-S Jun	4	1
	WC	Patrick Jozwik	3	1				15	H Tecău	6	6
	15	Horia Tecău	6	6																			E Scherer	1	1
	10	Jose-Luis Muguruza	6	6																		5	J-W Tsonga	6	6
	WC	Clint Harris	3	1				10	J-L Muguruza	1	2
		Sergiy Stakhovsky	6	6					S Stakhovsky	6	6
		Goran Belosevic	4	0												S Stakhovsky	4	0r
	Q	Jimmy Schneider	62	7	0										5	J-W Tsonga	6	2
		Adam Feeney	77	5	6				A Feeney	2	3
	WC	Chris Biro	0	2				5	J-W Tsonga	6	6
	5	Jo-Wilfried Tsonga	6	6

Bottom half

Section 3

	First round							Second round							Third round							Quarterfinals
	8	Chris Guccione	6	6
	Q	Ruben Gonzales	2	3				8	C Guccione	6	6
		Roman Kutac	65	77	2				J de Armas	1	1
		Juan de Armas	77	63	6										8	C Guccione	66	4
	Q	Andrei Radulescu	4	3											12	P Simmonds	78	6
	WC	David Jeflea	6	2r				Q	A Radulescu	1	1
		Andis Juška	3	5				12	P Simmonds	6	6
	12	Phillip Simmonds	6	7																		12	P Simmonds	0	2
	16	Mischa Zverev	7	6																		4	M Montcourt	6	6
	WC	Chris Letcher	5	4				16	M Zverev	6	6
		Richard Irwin	4	4					G.D. Jones	3	0
		G.D. Jones	6	6											16	M Zverev	2	3
		Karan Rastogi	6	6											4	M Montcourt	6	6
	WC	Lachlan Ferguson	2	2					K Rastogi	4	5
		Karolj Fodor	4	2				4	M Montcourt	6	7
	4	Mathieu Montcourt	6	6

Section 4

	First round							Second round							Third round							Quarterfinals
	6	Florin Mergea	6	77
	Q	Sergei Bubka	2	62				6	F Mergea	6	6
		Marco Hosang	6	6					M Hosang	2	2
		Fotis Fotakis	4	2											6	F Mergea	3	6	6
		Patrick Woelfler	7	6												P Woelfler	6	3	3
		Lado Chikhladze	5	4					P Woelfler	7	0	6
		Adrian Szatmary	4	2				11	D Brewer	5	6	2
	11	David Brewer	6	6																		6	F Mergea	6	6
	14	Gaël Monfils	6	6																		14	G Monfils	3	2
	Q	Ervin Eleskovic	2	4				14	G Monfils	3	7	6
	WC	David Galic	3	3				WC	J Kerley	6	5	3
	WC	Joel Kerley	6	6											14	G Monfils	6	6
		Suk Hyun-joon	7	6											2	B Baker	4	4
		Artem Sitak	5	1					H-j Suk	6	2	7
		Kenichiro Nakahara	2	1				2	B Baker	4	6	9
	2	Brian Baker	6	6

Sources

• Draw