| Boys Baseball Class AA Bracket | 1998-99 |
| Edwardsville (H.S.) Sectional | ||||||
| Regionals | Sectionals | State Qualifier | ||||
| (1) Collinsville | (1) Collinsville 11-8 |
Belleville (Althoff) 9-4 |
Belleville (East) 10-8 |
Edwardsville (H.S.) 12-1 (5 inn.) |
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| (4) Cahokia | (4) Cahokia 10-6 |
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| (5) East St. Louis (Sr.) | ||||||
| (2) Belleville (Althoff) | (2) Belleville (Althoff) 7-2 |
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| (3) Belleville (West) | ||||||
| (1) Belleville (East) | (1) Belleville (East) 13-4 |
Belleville (East) 6-0 |
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| (4) Mascoutah | (4) Mascoutah 14-1 (5 inn.) |
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| (5) Centralia | ||||||
| (2) O'Fallon | (2) O'Fallon 5-1 |
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| (3) Highland | (3) Highland 10-0 (6 inn.) |
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| (6) Waterloo (H.S.) | ||||||
| (1) Edwardsville (H.S.) | (1) Edwardsville (H.S.) 10-0 (6 inns) |
Edwardsville (H.S.) 9-2 |
Edwardsville (H.S.) 10-6 |
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| (4) Jerseyville (Jersey) | (5) Alton (Sr.) 12-2 |
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| (5) Alton (Sr.) | ||||||
| (2) St. Jacob (Triad) | (2) St. Jacob (Triad) 12-2 (6 inns) |
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| (3) Bethalto (Civic Memorial) | (6) Granite City 4-3 |
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| (6) Granite City | ||||||
| (1) Mt. Vernon | (1) Mt. Vernon 7-0 |
Mt. Vernon 11-0 (6 Innings) |
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| (4) Salem | (4) Salem 5-0 |
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| (5) Carbondale | ||||||
| (2) Marion (H.S.) | (2) Marion (H.S.) 9-3 |
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| (3) Murphysboro | ||||||