6‑Oct‑2003 | Dharwad CH | Hard | R32 | 258 | 249 | (7)Guillermo Garcia Lopez [ESP] d. Marach | 4-6 7-6(5) 7-5 | | | | | | | | | |
29‑Sep‑2003 | Tumkur CH | Hard | R16 | 264 | 279 | Stephane Bohli [SUI] d. (7)Marach | 6-2 6-0 | | | | | | | | | |
29‑Sep‑2003 | Tumkur CH | Hard | R32 | 264 | 620 | (7)Marach d. (WC)Sunil Kumar Sipaeya [IND] | 5-7 6-2 6-3 | | | | | | | | | |
15‑Sep‑2003 | Tehran CH | Clay | R32 | 264 | 402 | Philipp Mullner [AUT] d. (4)Marach | 7-5 3-1 RET | | | | | | | | | |
1‑Sep‑2003 | Brasov CH | Clay | R16 | 269 | 214 | (5)Daniel Elsner [GER] d. Marach | 4-6 6-2 6-3 | | | | | | | | | |
1‑Sep‑2003 | Brasov CH | Clay | R32 | 269 | 474 | Marach d. (WC)Gabriel Moraru [ROU] | 7-6(3) 6-3 | | | | | | | | | |
25‑Aug‑2003 | Brindisi CH | Clay | R32 | 269 | 226 | Tomas Tenconi [ITA] d. Marach | 7-6(4) 6-1 | | | | | | | | | |
25‑Aug‑2003 | US Open | Hard | Q2 | 269 | 140 | (24)Stefano Pescosolido [ITA] d. Marach | 6-3 6-4 | | | | | | | | | |
25‑Aug‑2003 | US Open | Hard | Q1 | 269 | 230 | Marach d. Mariano Delfino [ARG] | 7-6(5) 6-3 | | | | | | | | | |
11‑Aug‑2003 | Graz CH | Hard | R32 | 263 | 270 | Alexander Peya [AUT] d. Marach | 6-3 7-6(6) | | | | | | | | | |
28‑Jul‑2003 | St Petersburg CH | Clay | SF | 284 | 268 | (8)Michal Mertinak [SVK] d. (7)Marach | 6-1 2-6 6-4 | | | | | | | | | |
28‑Jul‑2003 | St Petersburg CH | Clay | QF | 284 | 365 | (7)Marach d. Ladislav Svarc [SVK] | 6-4 6-2 | | | | | | | | | |
28‑Jul‑2003 | St Petersburg CH | Clay | R16 | 284 | 1124 | (7)Marach d. (WC)Nikolay Mishin [RUS] | 6-1 6-0 | | | | | | | | | |
28‑Jul‑2003 | St Petersburg CH | Clay | R32 | 284 | 353 | (7)Marach d. Orest Tereshchuk [UKR] | 6-4 6-3 | | | | | | | | | |
7‑Jul‑2003 | Oberstaufen CH | Clay | R32 | 248 | 278 | (Q)Yuri Schukin [KAZ] d. Marach | 2-6 6-0 7-5 | | | | | | | | | |
30‑Jun‑2003 | Zell CH | Clay | QF | 249 | 169 | (5)Janko Tipsarevic [SRB] d. Marach | 6-3 6-2 | | | | | | | | | |
30‑Jun‑2003 | Zell CH | Clay | R16 | 249 | 306 | Marach d. Marc Gicquel [FRA] | 6-3 6-4 | | | | | | | | | |
30‑Jun‑2003 | Zell CH | Clay | R32 | 249 | 353 | Marach d. Razvan Sabau [ROU] | 6-1 6-1 | | | | | | | | | |
23‑Jun‑2003 | Wimbledon | Grass | Q1 | 249 | 222 | Jan Hernych [CZE] d. Marach | 7-5 6-2 | | | | | | | | | |
2‑Jun‑2003 | Furth CH | Clay | SF | 266 | 325 | (Q)Jan Frode Andersen [NOR] d. (Q)Marach | 6-3 6-3 | | | | | | | | | |
2‑Jun‑2003 | Furth CH | Clay | QF | 266 | 161 | (Q)Marach d. Jiri Vanek [CZE] | 6-2 7-6(8) | | | | | | | | | |
2‑Jun‑2003 | Furth CH | Clay | R16 | 266 | 202 | (Q)Marach d. Todd Larkham [AUS] | 6-4 6-3 | | | | | | | | | |
2‑Jun‑2003 | Furth CH | Clay | R32 | 266 | 120 | (Q)Marach d. (4)Werner Eschauer [AUT] | 6-4 1-6 6-2 | | | | | | | | | |
19‑May‑2003 | Budapest CH | Clay | SF | 311 | 288 | Johan Settergren [SWE] d. Marach | 7-6(2) 6-0 | | | | | | | | | |
19‑May‑2003 | Budapest CH | Clay | QF | 311 | 348 | Marach d. (Q)Alessio Di Mauro [ITA] | 7-6(3) 7-5 | | | | | | | | | |
19‑May‑2003 | Budapest CH | Clay | R16 | 311 | 313 | Marach d. Dieter Kindlmann [GER] | 6-4 6-2 | | | | | | | | | |
19‑May‑2003 | Budapest CH | Clay | R32 | 311 | 337 | Marach d. Frank Moser [GER] | 6-2 6-4 | | | | | | | | | |
28‑Apr‑2003 | Hungary F1 | Clay | QF | 324 | 359 | Lukasz Kubot [POL] d. (7)Marach | 7-5 4-6 6-3 | | | | | | | | | |
28‑Apr‑2003 | Hungary F1 | Clay | R16 | 324 | 544 | (7)Marach d. Solon Peppas [GRE] | 3-6 7-5 6-1 | | | | | | | | | |
28‑Apr‑2003 | Hungary F1 | Clay | R32 | 324 | 1340 | (7)Marach d. (WC)Gyorgy Balazs [HUN] | 7-5 6-3 | | | | | | | | | |
21‑Apr‑2003 | Germany F1 | Clay | R16 | 323 | 471 | Marc Kevin Goellner [GER] d. (5)Marach | 4-6 6-1 6-2 | | | | | | | | | |
21‑Apr‑2003 | Germany F1 | Clay | R32 | 323 | 491 | (5)Marach d. Jakub Hasek [CZE] | 6-0 6-3 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 1 | Clay | F | 339 | 596 | (3)Daniel Koellerer [AUT] d. (8)Marach | 6-4 4-6 6-3 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 1 | Clay | SF | 339 | 353 | (8)Marach d. (1)Vincenzo Santopadre [ITA] | 6-1 1-6 6-4 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 2 | Clay | SF | 339 | 353 | (5)Vincenzo Santopadre [ITA] d. (3)Marach | 5-3 RET | | | | | | | | | |
3‑Mar‑2003 | Italy 1 4 | Clay | SF | 339 | 596 | (1)Daniel Koellerer [AUT] d. (3)Marach | 6-1 7-5 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 1 | Clay | QF | 339 | 629 | (8)Marach d. Jaroslav Pospisil [CZE] | 6-7(3) 7-5 6-2 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 2 | Clay | QF | 339 | 588 | (3)Marach d. Bastian Gronefeld [GER] | 7-5 6-2 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 4 | Clay | QF | 339 | 598 | (3)Marach d. (7)Francesco Aldi [ITA] | 4-6 7-6(6) 6-2 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 1 | Clay | R16 | 339 | 625 | (8)Marach d. Johannes Ager [AUT] | 6-3 6-4 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 2 | Clay | R16 | 339 | 720 | (3)Marach d. Victor Ionita [ROU] | 6-1 3-6 6-4 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 4 | Clay | R16 | 339 | 283 | (3)Marach d. Alessio Di Mauro [ITA] | 6-4 6-4 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 1 | Clay | R32 | 339 | 1277 | (8)Marach d. (Q)Farrukh Dustov [UZB] | 7-6(5) 6-2 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 2 | Clay | R32 | 339 | 682 | (3)Marach d. Lars Zimmermann [GER] | 2-6 6-0 6-1 | | | | | | | | | |
3‑Mar‑2003 | Italy 1 3 | Clay | R32 | 339 | | (Q)Ivan Sikula [SVK] d. (3)Marach | 7-6(4) 6-7(8) 6-2 | | | | | | | | | |
17‑Feb‑2003 | Great Britain F4 | Hard | R16 | 342 | 787 | (Q)Josh Goffi [BRA] d. Marach | 6-3 7-6(6) | | | | | | | | | |
17‑Feb‑2003 | Great Britain F4 | Hard | R32 | 342 | 304 | Marach d. Marcello Craca [GER] | 7-6(1) 6-3 | | | | | | | | | |
10‑Feb‑2003 | Great Britain F3 | Hard | R32 | 339 | 386 | Mark Hilton [GBR] d. Marach | 6-3 4-6 6-3 | | | | | | | | | |
7‑Feb‑2003 | Davis Cup G1 R1: NOR vs AUT | Hard | RR | 335 | 1332 | Marach d. Fredrik Aarum [NOR] | 6-4 6-2 | | | | | | | | | |