| Boys Baseball Class AA Bracket | 1998-99 |
| Springfield (H.S.) Sectional | ||||||
| Regionals | Sectionals | State Qualifier | ||||
| (1) Normal (Community West) | (1) Normal (Community West) 3-2 |
Normal (Community West) 5-4 |
Normal (Community West) 13-3 (6 inn.) |
Champaign (Centennial) 7-6 (9 inn.) |
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| (4) Bloomington (H.S.) | (4) Bloomington (H.S.) 12-7 |
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| (5) Normal (Community) | ||||||
| (2) Morton | (2) Morton 6-1 |
(2) Morton 5-4 |
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| (7) Pontiac | ||||||
| (3) East Peoria | (3) East Peoria 8-4 |
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| (6) Pekin | ||||||
| (1) Mattoon | (1) Mattoon 11-3 |
Mattoon 11-10 |
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| (4) Paris | (5) Decatur (MacArthur) 12-4 |
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| (5) Decatur (MacArthur) | ||||||
| (2) Effingham (H.S.) | (2) Effingham (H.S.) 10-0 |
(3) Charleston 10-9 |
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| (7) Decatur (Stephen Decatur) | ||||||
| (3) Charleston | (3) Charleston 10-1 |
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| (6) Decatur (Eisenhower) | ||||||
| (1) Champaign (Centennial) | (1) Champaign (Centennial) 10-1 (7 inn.) |
(1) Champaign (Centennial) 7-6 (8 inns) |
Champaign (Centennial) 7-2 |
Champaign (Centennial) 11-1 (5 inn.) |
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| (8) Champaign (Central) | ||||||
| (4) Danville (H.S.) | (5) Rantoul 13-4 |
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| (5) Rantoul | ||||||
| (2) Urbana (H.S.) | (2) Urbana (H.S.) 15-7 |
(2) Urbana (H.S.) 10-4 |
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| (7) Mahomet (M.-Seymour) | ||||||
| (3) Kankakee (Sr.) | (6) Bradley (B.-Bourbonnais) 9-2 |
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| (6) Bradley (B.-Bourbonnais) | ||||||
| (1) Chatham (Glenwood) | (1) Chatham (Glenwood) 14-4 (6 inns) |
(5) Jacksonville (H.S.) 7-5 |
Quincy (Sr.) 4-2 |
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| (8) Lincoln | (8) Lincoln 5-4 |
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| (9) Taylorville | ||||||
| (4) Springfield (Sacred Heart-Griffin) | (5) Jacksonville (H.S.) 4-1 |
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| (5) Jacksonville (H.S.) | ||||||
| (2) Springfield (H.S.) | (7) Quincy (Sr.) 8-7 |
(7) Quincy (Sr.) 7-4 |
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| (7) Quincy (Sr.) | ||||||
| (3) Springfield (Lanphier) | (3) Springfield (Lanphier) 7-4 |
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| (6) Springfield (Southeast) | ||||||