| Boys Baseball Class AA Bracket | 1998-99 |
| Lockport (Twp.) Sectional | ||||||
| Regionals | Sectionals | State Qualifier | ||||
| (1) Downers Grove (South) | (1) Downers Grove (South) 14-3 (4 1/2 inn) |
(4) Darien (Hinsdale South) 14-1 (5 inns) |
Darien (Hinsdale South) 8-5 |
Darien (Hinsdale South) 11-1 (6 inn) |
St. Charles 6-4 |
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| (8) Villa Park (Willowbrook) | (8) Villa Park (Willowbrook) 6-0 |
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| (9) Bensenville (Fenton) | ||||||
| (4) Darien (Hinsdale South) | (4) Darien (Hinsdale South) 3-0 |
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| (5) Addison (A. Trail) | ||||||
| (2) Hinsdale (Central) | (2) Hinsdale (Central) 7-4 |
(2) Hinsdale (Central) 4-0 |
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| (7) Elmhurst (York) | ||||||
| (3) Downers Grove (North) | (6) Lombard (Glenbard East) 15-9 |
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| (6) Lombard (Glenbard East) | ||||||
| (1) Joliet (Twp.) | (1) Joliet (Twp.) 11-6 |
(1) Joliet (Twp.) 11-5 |
Morris 7-1 (6 inn.) |
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| (8) Romeoville | (9) Bolingbrook 10-8 (8 Inn.) |
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| (9) Bolingbrook | ||||||
| (4) Lockport (Twp.) | (4) Lockport (Twp.) 2-1 |
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| (5) Joliet (Catholic Academy) | ||||||
| (2) Morris | (2) Morris 15-9 |
(2) Morris 11-6 |
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| (7) Lemont (H.S.) | ||||||
| (3) Minooka | (6) Plainfield 9-4 |
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| (6) Plainfield | ||||||
| (1) Wheaton (W. Warrenville South) | (1) Wheaton (W. Warrenville South) 11-1 (6 inn.) |
(4) Wheaton (North) 5-4 |
Wheaton (North) 2-0 |
St. Charles 10-0 (5 inn) |
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| (8) Lisle (Benet Academy) | (9) Glen Ellyn (Glenbard South) 5-2 |
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| (9) Glen Ellyn (Glenbard South) | ||||||
| (4) Wheaton (North) | (4) Wheaton (North) 10-7 |
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| (5) Naperville (Central) | ||||||
| (2) Aurora (Waubonsie Valley) | (2) Aurora (Waubonsie Valley) 11-10 |
(2) Aurora (Waubonsie Valley) 7-5 |
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| (7) Glen Ellyn (Glenbard West) | (7) Glen Ellyn (Glenbard West) 3-0 |
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| (10) Naperville (Neuqua Valley) | ||||||
| (3) Carol Stream (Glenbard North) | (3) Carol Stream (Glenbard North) 10-7 |
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| (6) Naperville (North) | ||||||
| (1) St. Charles | (1) St. Charles 5-1 |
(1) St. Charles 8-4 |
St. Charles 9-6 |
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| (8) Aurora (East) | (8) Aurora (East) 3-2 |
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| (9) Aurora (Illinois Math and Science Academy) | ||||||
| (4) West Chicago (H.S.) | (5) Aurora (West) 7-0 |
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| (5) Aurora (West) | ||||||
| (2) Batavia | (2) Batavia 3-0 |
(2) Batavia 10-3 |
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| (7) Oswego | ||||||
| (3) Geneva | (3) Geneva 12-5 |
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| (6) Aurora (Marmion Academy) | ||||||