| Boys Baseball Class A Bracket | 1998-99 |
| Mendota Sectional | ||||||
| Regionals | Sectionals | State Qualifier | ||||
| (1) East Dubuque | (1) East Dubuque 11-1 |
(1) East Dubuque 8-0 |
Oregon 4-0 |
Kewanee (Wethersfield) 4-3 |
Ottawa (Marquette) 6-2 |
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| (8) Warren (Coop) | (8) Warren (Coop) 7-2 |
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| (9) Dakota | ||||||
| (4) Pearl City | (4) Pearl City 5-0 |
(4) Pearl City 8-7 (9 inn) |
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| (13) Mt. Carroll (Coop) | ||||||
| (5) Lena (L.-Winslow) | (5) Lena (L.-Winslow) 6-5 |
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| (12) Winnebago | ||||||
| (2) Milledgeville | (2) Milledgeville 11-1 (6 Inn) |
(2) Milledgeville 16-4 (5 inn) |
(3) Oregon 9-4 |
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| (15) Thomson (Coop) | ||||||
| (7) Forreston | (10) Durand (Coop) 2-1 |
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| (10) Durand (Coop) | ||||||
| (3) Oregon | (3) Oregon 9-2 |
(3) Oregon 11-1 5inn |
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| (14) Elizabeth (River Ridge) (Coop) | ||||||
| (6) Galena | (11) Lanark (Eastland) 6-4 (9 inn.) |
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| (11) Lanark (Eastland) | ||||||
| (1) Chillicothe (Illinois Valley Central) | (1) Chillicothe (Illinois Valley Central) 2-1 |
(4) Kewanee (Wethersfield) 11-0 |
Kewanee (Wethersfield) 17-14 |
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| (8) Roanoke (R.-Benson) (Coop) | (8) Roanoke (R.-Benson) (Coop) 10-7 |
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| (9) Kewanee (H.S.) (Coop) | ||||||
| (4) Kewanee (Wethersfield) | (4) Kewanee (Wethersfield) 11-0 |
(4) Kewanee (Wethersfield) 6-2 |
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| (13) Toulon (Stark County) | ||||||
| (5) Princeville | (5) Princeville 10-0 |
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| (12) Peoria Heights | ||||||
| (2) Eureka | (2) Eureka 14-4 |
(3) Dunlap 12-6 |
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| (7) Manlius (Bureau Valley) | (7) Manlius (Bureau Valley) 8-1 |
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| (10) Peoria (P. Christian) | ||||||
| (3) Dunlap | (3) Dunlap 11-1 |
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| (6) Henry (H.-Senachwine) (Coop) | (6) Henry (H.-Senachwine) (Coop) 9-0 |
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| (11) Varna (Midland) | ||||||
| (1) Ottawa (Marquette) | (1) Ottawa (Marquette) 9-0 |
(1) Ottawa (Marquette) 11-1 |
Ottawa (Marquette) 3-2 |
Ottawa (Marquette) 10-7 |
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| (8) Morrison | (8) Morrison 5-2 (7 inn.) |
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| (9) Rock Falls | ||||||
| (4) Granville (Putnam County) | (4) Granville (Putnam County) 10-0 |
(4) Granville (Putnam County) 10-0 (5 inn) |
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| (13) Ashton (Coop) | ||||||
| (5) Sterling (Newman Central Catholic) | (5) Sterling (Newman Central Catholic) 13-1 |
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| (12) LaMoille (Coop) | ||||||
| (2) Seneca | (2) Seneca 13-1 (5 inn.) |
(2) Seneca 2-1 |
(6) Peru (St. Bede) 4-0 |
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| (15) Paw Paw | ||||||
| (7) Serena | (7) Serena 5-3 |
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| (10) Spring Valley (Hall) | ||||||
| (3) Mendota | (3) Mendota 15-5 (6 inn.) |
(6) Peru (St. Bede) 8-4 |
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| (14) Prophetstown (Coop) | ||||||
| (6) Peru (St. Bede) | (6) Peru (St. Bede) 13-3 |
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| (11) Earlville (Coop) | ||||||
| (1) Rock Island (Alleman) | (1) Rock Island (Alleman) 11-1 |
(1) Rock Island (Alleman) 5-3 |
Rock Island (Alleman) 10-0 (5 inn) |
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| (8) Oneida (ROWVA) | (8) Oneida (ROWVA) 14-4 |
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| (9) Aledo | ||||||
| (4) Sherrard | (4) Sherrard 11-1 |
(4) Sherrard 12-6 |
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| (13) Woodhull (AlWood) | ||||||
| (5) Monmouth (H.S.) | (5) Monmouth (H.S.) 14-4 |
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| (12) Biggsville (Union) | ||||||
| (2) Taylor Ridge (Rockridge) | (2) Taylor Ridge (Rockridge) 9-5 |
(6) Port Byron (Riverdale) 5-2 |
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| (7) Orion | (7) Orion 3-1 |
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| (10) Galva | ||||||
| (3) Knoxville | (3) Knoxville 13-6 |
(6) Port Byron (Riverdale) 3-0 |
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| (14) Williamsfield | ||||||
| (6) Port Byron (Riverdale) | (6) Port Byron (Riverdale) 14-4 |
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| (11) Joy (Westmer) | ||||||