The 2002 Delphi Indy 300 was an Indy Racing League (IRL) motor race held on September 8, 2002, at Chicagoland Speedway in Joliet, Illinois. It was the 14th of 15 scheduled rounds of the 2002 Indy Racing League and the second annual running of the eventPanther Racing driver Sam Hornish Jr. won the 200-lap race from pole position with the closest margin of victory in the IRL of 0.0024 seconds over Al Unser Jr. of Kelley Racing. Third place was Hemelgarn Racing's Buddy Lazier.

Hornish won the second pole position of his IRL career by posting the fastest lap in qualifying. In the race, Hornish led until he was passed by Buddy Rice after the first restart that was necessitated by a caution to tend to Laurent Rédon's car on the 25th lap. Hornish retook it when he got ahead of Unser on lap 75 but lost it to Scott Sharp 42 laps later. Sharp lost the first position to Hornish on lap 151. Unser returned to the lead after he overtook Hélio Castroneves on the 167th lap. Unser and Hornish exchanged the lead for the rest of the race, and it was Hornish who edged out Unser to secure his fourth victory of the season, and the seventh of his career.

There were five cautions and eighteen lead changes among four drivers during the course of the event. The result promoted Hornish to the top of the points' standings with 481 points. Castroneves, who led the championship before the race, dropped to second, while his Team Penske teammate Gil de Ferran fell to third after crashing heavily on the 52nd lap. Felipe Giaffone and Alex Barron maintained fourth and fifth with one race left in the season.

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