24‑Nov‑2003 | Milan1 CH | Carpet | R16 | 162 | 111 | (5)Dennis Van Scheppingen [NED] d. Udomchoke | 6-2 6-3 | | | | | | | | | |
24‑Nov‑2003 | Milan1 CH | Carpet | R32 | 162 | 153 | Udomchoke d. Vincenzo Santopadre [ITA] | 7-6(7) 6-3 | | | | | | | | | |
17‑Nov‑2003 | Prague2 CH | Carpet | R16 | 155 | 126 | (7)Stefano Pescosolido [ITA] d. Udomchoke | 6-4 0-6 6-3 | | | | | | | | | |
17‑Nov‑2003 | Prague2 CH | Carpet | R32 | 155 | 157 | Udomchoke d. Bjorn Phau [GER] | 6-2 2-0 RET | | | | | | | | | |
10‑Nov‑2003 | Helsinki2 CH | Hard | R32 | 156 | 166 | Julian Knowle [AUT] d. Udomchoke | 7-5 6-3 | | | | | | | | | |
3‑Nov‑2003 | Eckental CH | Carpet | R32 | 158 | 174 | Tuomas Ketola [FIN] d. Udomchoke | 7-6(5) 6-4 | | | | | | | | | |
13‑Oct‑2003 | Belgaum CH | Hard | R16 | 153 | 282 | Yuri Schukin [KAZ] d. (1)Udomchoke | 7-5 3-2 RET | | | | | | | | | |
13‑Oct‑2003 | Belgaum CH | Hard | R32 | 153 | 360 | (1)Udomchoke d. Orest Tereshchuk [UKR] | 3-6 6-6 6-0 | | | | | | | | | |
6‑Oct‑2003 | Dharwad CH | Hard | F | 183 | 211 | (1)Udomchoke d. (3)Jimmy Wang [TPE] | 7-6(5) 6-1 | | | | | | | | | |
6‑Oct‑2003 | Dharwad CH | Hard | SF | 183 | 217 | (1)Udomchoke d. (4)Rik De Voest [RSA] | 3-6 6-2 7-5 | | | | | | | | | |
6‑Oct‑2003 | Dharwad CH | Hard | QF | 183 | 218 | (1)Udomchoke d. (5)Philipp Kohlschreiber [GER] | 6-4 6-4 | | | | | | | | | |
6‑Oct‑2003 | Dharwad CH | Hard | R16 | 183 | 317 | (1)Udomchoke d. Teymuraz Gabashvili [RUS] | 6-4 7-5 | | | | | | | | | |
6‑Oct‑2003 | Dharwad CH | Hard | R32 | 183 | 392 | (1)Udomchoke d. (Q)Leonardo Azzaro [ITA] | 3-6 6-2 7-6(1) | | | | | | | | | |
22‑Sep‑2003 | Bangkok | Hard | R32 | 191 | 37 | (5)Jarkko Nieminen [FIN] d. (WC)Udomchoke | 6-4 6-1 | | 0.62 | 3.8% | 3.8% | 56.6% | 50.0% | 39.1% | 7/12 | 1:00 |
19‑Sep‑2003 | Davis Cup WG PO: THA vs CZE | Hard | RR | 187 | 12 | Jiri Novak [CZE] d. Udomchoke | 6-2 6-2 7-6(1) | | | | | | | | | |
19‑Sep‑2003 | Davis Cup WG PO: THA vs CZE | Hard | RR | 187 | 105 | Tomas Berdych [CZE] d. Udomchoke | 7-6(2) 6-3 | | | | | | | | | |
1‑Sep‑2003 | Istanbul CH | Hard | R32 | 191 | 181 | Bjorn Phau [GER] d. Udomchoke | 6-3 6-3 | | | | | | | | | |
11‑Aug‑2003 | Bronx CH | Hard | R32 | 179 | 189 | Rik De Voest [RSA] d. Udomchoke | 6-1 6-4 | | | | | | | | | |
4‑Aug‑2003 | Binghamton CH | Hard | QF | 188 | 170 | Julien Benneteau [FRA] d. Udomchoke | 6-3 6-2 | | | | | | | | | |
4‑Aug‑2003 | Binghamton CH | Hard | R16 | 188 | 164 | Udomchoke d. (4)Ricardo Mello [BRA] | 6-4 6-3 | | | | | | | | | |
4‑Aug‑2003 | Binghamton CH | Hard | R32 | 188 | 149 | Udomchoke d. Paul Baccanello [AUS] | 7-5 7-6(2) | | | | | | | | | |
28‑Jul‑2003 | Belo Horizonte CH | Hard | F | 204 | 317 | Julio Peralta [CHI] d. (4)Udomchoke | 7-6(6) 1-6 6-1 | | | | | | | | | |
28‑Jul‑2003 | Belo Horizonte CH | Hard | SF | 204 | 286 | (4)Udomchoke d. Miguel Gallardo Valles [MEX] | 6-1 6-0 | | | | | | | | | |
28‑Jul‑2003 | Belo Horizonte CH | Hard | QF | 204 | 446 | (4)Udomchoke d. Thiago Alves [BRA] | 6-4 6-3 | | | | | | | | | |
28‑Jul‑2003 | Belo Horizonte CH | Hard | R16 | 204 | 297 | (4)Udomchoke d. Pedro Braga [BRA] | 6-4 6-1 | | | | | | | | | |
28‑Jul‑2003 | Belo Horizonte CH | Hard | R32 | 204 | 225 | (4)Udomchoke d. Gouichi Motomura [JPN] | 6-3 7-6(2) | | | | | | | | | |
21‑Jul‑2003 | Campos Do Jordao1 CH | Hard | R16 | 189 | 352 | Julio Peralta [CHI] d. (1)Udomchoke | 7-6(5) 6-2 | | | | | | | | | |
21‑Jul‑2003 | Campos Do Jordao1 CH | Hard | R32 | 189 | 376 | (1)Udomchoke d. Carlos Berlocq [ARG] | 6-2 6-4 | | | | | | | | | |
14‑Jul‑2003 | Aptos CH | Hard | R32 | 179 | 209 | Jeff Morrison [USA] d. Udomchoke | 4-6 7-6(5) 6-1 | | | | | | | | | |
7‑Jul‑2003 | Granby CH | Hard | QF | 187 | 232 | Frederic Niemeyer [CAN] d. (5)Udomchoke | 6-3 6-7(3) 6-3 | | | | | | | | | |
7‑Jul‑2003 | Granby CH | Hard | R16 | 187 | 1019 | (5)Udomchoke d. (Q)Sanjin Sadovich [CAN] | 7-6(4) 3-6 6-1 | | | | | | | | | |
7‑Jul‑2003 | Granby CH | Hard | R32 | 187 | 273 | (5)Udomchoke d. Marco Chiudinelli [SUI] | 6-3 6-2 | | | | | | | | | |
9‑Jun‑2003 | Atlantic City CH | Hard | R16 | 185 | 376 | (Q)Dusan Vemic [SRB] d. (5)Udomchoke | 6-3 6-4 | | | | | | | | | |
9‑Jun‑2003 | Atlantic City CH | Hard | R32 | 185 | 1291 | (5)Udomchoke d. (WC)Ben Kronk [USA] | 6-0 6-1 | | | | | | | | | |
2‑Jun‑2003 | Tallahassee CH | Hard | R32 | 178 | 271 | Peter Clarke [IRL] d. (6)Udomchoke | 2-6 6-2 6-3 | | | | | | | | | |
26‑May‑2003 | Turin CH | Clay | R32 | 178 | 275 | (Q)Didac Perez [ESP] d. Udomchoke | 4-6 7-6(8) 4-1 RET | | | | | | | | | |
12‑May‑2003 | Fergana CH | Hard | R16 | 185 | 259 | Michal Tabara [CZE] d. (4)Udomchoke | 7-5 3-6 7-6(5) | | | | | | | | | |
12‑May‑2003 | Fergana CH | Hard | R32 | 185 | 1107 | (4)Udomchoke d. (WC)Murad Inoyatov [UZB] | 6-1 6-3 | | | | | | | | | |
28‑Apr‑2003 | New Delhi CH | Hard | F | 209 | 154 | (5)Ivo Heuberger [SUI] d. Udomchoke | 6-2 6-3 | | | | | | | | | |
28‑Apr‑2003 | New Delhi CH | Hard | SF | 209 | 243 | Udomchoke d. Louis Vosloo [RSA] | 6-3 6-1 | | | | | | | | | |
28‑Apr‑2003 | New Delhi CH | Hard | QF | 209 | 102 | Udomchoke d. (1)John Van Lottum [NED] | 3-6 7-5 6-0 | | | | | | | | | |
28‑Apr‑2003 | New Delhi CH | Hard | R16 | 209 | 168 | Udomchoke d. (6)Yen Hsun Lu [TPE] | W/O | | | | | | | | | |
28‑Apr‑2003 | New Delhi CH | Hard | R32 | 209 | 323 | Udomchoke d. (WC)Rohan Bopanna [IND] | 7-5 6-2 | | | | | | | | | |
21‑Apr‑2003 | Bangalore CH | Hard | R32 | 210 | 277 | Alun Jones [AUS] d. Udomchoke | 6-3 1-6 6-3 | | | | | | | | | |
7‑Apr‑2003 | Uzbekistan F2 | Hard | F | 217 | 415 | (8)Stephane Bohli [SUI] d. (2)Udomchoke | 6-1 6-1 | | | | | | | | | |
7‑Apr‑2003 | Uzbekistan F2 | Hard | SF | 217 | | (2)Udomchoke d. (4)Mikhail Elgin [RUS] | 6-2 2-6 6-2 | | | | | | | | | |
7‑Apr‑2003 | Uzbekistan F2 | Hard | QF | 217 | 378 | (2)Udomchoke d. (7)Stephane Robert [FRA] | 6-1 6-3 | | | | | | | | | |
7‑Apr‑2003 | Uzbekistan F2 | Hard | R16 | 217 | 466 | (2)Udomchoke d. Dmitri Sitak [RUS] | 6-2 3-6 6-3 | | | | | | | | | |
7‑Apr‑2003 | Uzbekistan F2 | Hard | R32 | 217 | 641 | (2)Udomchoke d. Lauri Kiiski [FIN] | 6-4 3-6 6-0 | | | | | | | | | |
4‑Apr‑2003 | Davis Cup G1 R2: UZB vs THA | Hard | RR | 220 | 145 | Udomchoke d. Vadim Kutsenko [RUS] | 6-2 6-2 6-3 | | | | | | | | | |
4‑Apr‑2003 | Davis Cup G1 R2: UZB vs THA | Hard | RR | 220 | 1111 | Udomchoke d. Murad Inoyatov [UZB] | 6-4 6-3 | | | | | | | | | |
10‑Mar‑2003 | Ho Chi Minh CH | Hard | SF | 220 | 244 | Amir Hadad [ISR] d. Udomchoke | 7-6(3) 6-7(3) 6-2 | | | | | | | | | |
10‑Mar‑2003 | Ho Chi Minh CH | Hard | QF | 220 | 204 | Udomchoke d. Jimmy Wang [TPE] | 6-2 6-2 | | | | | | | | | |
10‑Mar‑2003 | Ho Chi Minh CH | Hard | R16 | 220 | 1031 | Udomchoke d. Andy Ram [ISR] | 6-3 6-4 | | | | | | | | | |
10‑Mar‑2003 | Ho Chi Minh CH | Hard | R32 | 220 | 178 | Udomchoke d. (6)Simon Greul [GER] | 6-2 6-0 | | | | | | | | | |
3‑Mar‑2003 | Kyoto CH | Carpet | R32 | 218 | 251 | Yves Allegro [SUI] d. (8)Udomchoke | 7-6(5) 6-3 | | | | | | | | | |
24‑Feb‑2003 | Wrexham CH | Hard | R16 | 221 | 190 | (6)Yen Hsun Lu [TPE] d. Udomchoke | 7-6(5) 7-6(3) | | | | | | | | | |
24‑Feb‑2003 | Wrexham CH | Hard | R32 | 221 | 245 | Udomchoke d. Ladislav Svarc [SVK] | 4-6 7-6(4) 6-3 | | | | | | | | | |
17‑Feb‑2003 | Wolfsburg CH | Carpet | R32 | 219 | 187 | Yen Hsun Lu [TPE] d. Udomchoke | 6-3 7-5 | | | | | | | | | |
7‑Feb‑2003 | Davis Cup G1 R1: THA vs KOR | Carpet | RR | 213 | 397 | Udomchoke d. Dong Hyun Kim [KOR] | 6-3 5-7 6-1 6-2 | | | | | | | | | |
7‑Feb‑2003 | Davis Cup G1 R1: THA vs KOR | Carpet | RR | 213 | 647 | Udomchoke d. Hee Seok Chung [KOR] | 6-1 6-3 | | | | | | | | | |
27‑Jan‑2003 | Dallas CH | Hard | R32 | 213 | 169 | Tuomas Ketola [FIN] d. Udomchoke | 6-4 6-1 | | | | | | | | | |
20‑Jan‑2003 | Waikoloa CH | Hard | R32 | 208 | 317 | (WC)Dmitry Tursunov [RUS] d. Udomchoke | 6-1 6-3 | | | | | | | | | |