The lack of sponsorship prevented him from starting the season though he was called up to drive when regular driver Dario Franchitti broke his vertebrae in a motor bike accident in Scotland. In his first race driving the No. 27 Dallara IR-03 Honda HI3R V8 car, at the Indy Japan 300 at Twin Ring Motegi, Wheldon qualified fifth and finished the accident-shortened race seventh. Wheldon qualified for his first Indianapolis 500 in fifth. Late in the race, he struck a concrete retaining wall and somersaulted into the air before landing upside down, which relegated him to a 19th-place finish. After Franchitti returned, Wheldon was retained as a driver following the retirement of team owner and mentor Michael Andretti. He drove well thereafter with another eight top-ten finishes. Starting tenth at Chicagoland Speedway, Wheldon led for a season-high 38 laps and came fourth. He ended the season with a third-place finish at Texas Motor Speedway, finishing with 312 points (11th in the point standings). Wheldon's performances enhanced his reputation, and he demonstrated an accord with oval track racing that many European drivers lacked. He was awarded the 2003 IndyCar Series Rookie of the Year, and was voted the 2003 Autosport Rookie of the Year.