| Boys Baseball Class AA Bracket | 1998-99 |
| Skokie (Niles West) Sectional | ||||||
| Regionals | Sectionals | State Qualifier | ||||
| (1) Buffalo Grove | (1) Buffalo Grove 7-3 |
(1) Buffalo Grove 14-4 (6 inns) |
Buffalo Grove 11-0 (5 Innings) |
Buffalo Grove 9-4 |
Winnetka (New Trier) 15-6 |
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| (8) Wheeling | (8) Wheeling 15-2 |
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| (9) Park Ridge (Maine East) | ||||||
| (4) Glenview (Glenbrook South) | (5) Arlington Heights (Hersey) 9-3 |
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| (5) Arlington Heights (Hersey) | ||||||
| (2) Lincolnshire (Stevenson) | (2) Lincolnshire (Stevenson) 9-1 |
(2) Lincolnshire (Stevenson) 6-4 |
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| (7) Des Plaines (Maine West) | ||||||
| (3) Libertyville | (3) Libertyville 12-9 |
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| (6) Niles (Notre Dame) | ||||||
| (1) LaGrange Park (Nazareth Academy) | (1) LaGrange Park (Nazareth Academy) 18-8 (5 innings) |
(1) LaGrange Park (Nazareth Academy) 2-0 |
LaGrange Park (Nazareth Academy) 9-2 |
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| (8) Maywood (Proviso East) | ||||||
| (4) Northlake (Leyden) | (4) Northlake (Leyden) 7-1 |
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| (5) Westchester (St. Joseph) | ||||||
| (2) Park Ridge (Maine South) | (2) Park Ridge (Maine South) 6-4 |
(3) LaGrange (Lyons) 5-4 |
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| (7) River Grove (Holy Cross) | ||||||
| (3) LaGrange (Lyons) | (3) LaGrange (Lyons) 7-4 |
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| (6) Hillside (Proviso West) | ||||||
| (1) Oak Park (O.P.-River Forest) | (1) Oak Park (O.P.-River Forest) 29-0 |
(1) Oak Park (O.P.-River Forest) 10-1 |
Oak Park (Fenwick) 8-7 |
Winnetka (New Trier) 7-4 |
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| (8) Elmwood Park | ||||||
| (4) Berwyn-Cicero (Morton) | (5) Riverside (R.-Brookfield) 9-4 |
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| (5) Riverside (R.-Brookfield) | ||||||
| (2) Oak Park (Fenwick) | (2) Oak Park (Fenwick) 2-0 |
(2) Oak Park (Fenwick) 9-5 |
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| (7) Chicago (Gordon Tech) | ||||||
| (3) Chicago (St. Ignatius) | (3) Chicago (St. Ignatius) 14-7 |
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| (6) Chicago (St. Patrick) | ||||||
| (1) Winnetka (New Trier) | (1) Winnetka (New Trier) 16-4 |
(1) Winnetka (New Trier) 7-6 |
Winnetka (New Trier) 5-1 |
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| (8) Deerfield | (8) Deerfield 7-2 |
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| (9) Highland Park | ||||||
| (4) Skokie (Niles West) | (5) Northbrook (Glenbrook North) 10-3 |
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| (5) Northbrook (Glenbrook North) | ||||||
| (2) Evanston (Twp.) | (2) Evanston (Twp.) 5-4 |
(3) Wilmette (Loyola Academy) 10-0 (5 inn.) |
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| (7) Skokie (Niles North) | ||||||
| (3) Wilmette (Loyola Academy) | (3) Wilmette (Loyola Academy) 6-5 |
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| (6) Lake Forest (H.S.) | ||||||