Boys' singles
2003 US Open
Champion	Jo-Wilfried Tsonga
Runner-up	Marcos Baghdatis
Score	7–6(7–4), 6–3

Richard Gasquet was the defending champion, but did not compete in the juniors that year.

Jo-Wilfried Tsonga won the tournament, defeating Marcos Baghdatis in the final, 7–6^(7–4), 6–3.

Seeds

Draw

Finals

	Quarterfinals							Semifinals							Final
	1	Marcos Baghdatis	6	77
	WC	Scoville Jenkins	1	64
								1	Marcos Baghdatis	6	6
								4	Dudi Sela	2	1
	4	Dudi Sela	6	3	6
	7	Mathieu Montcourt	4	6	4
															1	Marcos Baghdatis	64	3
															5	Jo-Wilfried Tsonga	77	6
	5	Jo-Wilfried Tsonga	6	77
	3	Brian Baker	3	62
								5	Jo-Wilfried Tsonga	6	6
								2	Florin Mergea	4	4
	12	Andy Murray	1	5
	2	Florin Mergea	6	7

Top half

Section 1

	First round							Second round							Third round							Quarterfinals
	1	Marcos Baghdatis	4	6	77
		Adam Feeney	6	3	61			1	M Baghdatis	6	6
		Mischa Zverev	6	6					M Zverev	1	2
		Robert Cameron	2	2											1	M Baghdatis	6	6
		Julien Gely	1	6	6										13	F Gil	4	0
		Jamie Baker	6	4	2				J Gely	3	6	4
		Somdev Devvarman	77	65	5			13	F Gil	6	1	6
	13	Fred Gil	62	77	7																	1	M Baghdatis	6	77
	11	Bruno Rosa	6	66	6																	WC	S Jenkins	1	64
		Jaime Cuellar	3	78	1			11	B Rosa	3	2
	Q	Konstantin Kravchuk	4	6	2			WC	S Jenkins	6	6
	WC	Scoville Jenkins	6	4	6										WC	S Jenkins	4	6	7
		Brendan Evans	5	6	6										6	D Gimeno-Traver	6	1	5
		G.D. Jones	7	3	4				B Evans	6	4	3
	Q	Ruben Gonzales	4	4				6	D Gimeno-Traver	3	6	6
	6	Daniel Gimeno-Traver	6	6

Section 2

	First round							Second round							Third round							Quarterfinals
	4	Dudi Sela	6	6
	LL	Eric Scherer	3	3				4	D Sela	6	6
	Q	Horacio Zeballos	77	6				Q	H Zeballos	1	2
	WC	Gary Sacks	64	4											4	D Sela	6	6
		Robert Smeets	6	77												R Smeets	3	2
		Novak Djokovic	4	63					R Smeets	6	6
		Divij Sharan	6	4	4			16	H-j Suk	1	1
	16	Suk Hyun-joon	4	6	6																	4	D Sela	6	3	6
	10	Chris Kwon	62	5r																		7	M Montcourt	4	6	4
		Jerome Becker	77	5					J Becker	6	64	4
		Fritz Wolmarans	6	6					F Wolmarans	2	77	6
		Jose-Luis Muguruza	2	1												F Wolmarans	5	4
	WC	Michael Shabaz	1	4											7	M Montcourt	7	6
		Alex Kuznetsov	6	6					A Kuznetsov	6	4	3
		Mehdi Ziadi	2	4				7	M Montcourt	3	6	6
	7	Mathieu Montcourt	6	6

Bottom half

Section 3

	First round							Second round							Third round							Quarterfinals
	5	Jo-Wilfried Tsonga	6	4	6
	WC	Denis Zivkovic	3	6	4			5	J-W Tsonga	6	6
		Lado Chikhladze	63	67					J Goodall	3	4
		Josh Goodall	77	79											5	J-W Tsonga	77	6
		Nestor Briceno	4	3											9	S Rieschick	62	4
	WC	Vahid Mirzadeh	6	6				WC	V Mirzadeh	1	0
		Kim Sun-yong	2	2				9	S Rieschick	6	6
	9	Sebastian Rieschick	6	6																		5	J-W Tsonga	6	77
	14	Luis-Manuel Flores	6	6																		3	B Baker	3	62
	WC	Timothy Neilly	0	4				14	L-M Flores	77	1	6
	WC	Robert Yim	6	6				WC	R Yim	64	6	1
	Q	Fabio Fognini	0	3											14	L-M Flores	6	4	4
	Q	Gaël Monfils	6	6											3	B Baker	4	6	6
	Q	Miles Kasiri	4	2				Q	G Monfils	4	2
		Juan-Pablo Amado	1	1				3	B Baker	6	6
	3	Brian Baker	6	6

Section 4

	First round							Second round							Third round							Quarterfinals
	8	Chris Guccione	6	5	711
		Romano Tatuhey	4	7	69			8	C Guccione	713	6
		Matthias Wellermann	3	6	4				J Ouanna	611	4
		Josselin Ouanna	6	4	6										8	C Guccione	64	6	2
		Scott Oudsema	6	6											12	A Murray	77	4	6
		Aleksey Malajko	4	1					S Oudsema	4	4
	Q	Phillip Simmonds	79	4	3			12	A Murray	6	6
	12	Andy Murray	67	6	6																	12	A Murray	1	5
	15	Leonardo Kirche	6	4	6																	2	F Mergea	6	7
		Devin Mullings	3	6	1			15	L Kirche	4	4
	WC	Jamil Al Agba	2	77	6			WC	J Al Agba	6	6
	Q	Jesse Huta Galung	6	65	2										WC	J Al Agba	1	6	3
		Adam Fass	6	4	6										2	F Mergea	6	3	6
		Karan Rastogi	3	6	0				A Fass	5	1
		Rafael Arévalo	2	0				2	F Mergea	7	6
	2	Florin Mergea	6	6

Sources

• Draw