Cog Hill Golf & Country Club Western Open Western Open

| Year_ | Player | Country | Score | To_Par | Margin | Earnings_ |
|---|---|---|---|---|---|---|
| 2006 | Trevor Immelman | South Africa | 69-66-69-67=271 | −13 | 2 | 900000 |
| 2005 | Jim Furyk | United States | 64-70-67-69=270 | −14 | 2 | 900000 |
| 2004 | Stephen Ames | Canada | 67-73-64-70=274 | −10 | 2 | 864000 |
| 2003 | Tiger Woods | United States | 63-70-65-69=267 | −21 | 5 | 810000 |
| 2002 | Jerry Kelly | United States | 67-69-68-65=269 | −19 | 2 | 720000 |
| 2001 | Scott Hoch | United States | 69-68-66-64=267 | −21 | 1 | 648000 |
| 2000 | Robert Allenby | Australia | 69-69-68-68=274 | −14 | 0 | 540000 |
| 1999 | Tiger Woods | United States | 68-66-68-71=273 | −15 | 3 | 450000 |
| 1998 | Joe Durant | United States | 68-67-70-66=271 | −17 | 2 | 396000 |
| 1997 | Tiger Woods | United States | 67-72-68-68=275 | −13 | 3 | 360000 |
| 1996 | Steve Stricker | United States | 65-69-67-69=270 | −18 | 8 | 360000 |