2003 Grand Prix de Tennis de Lyon – Singles
| Singles | |
|---|---|
| 2003 Grand Prix de Tennis de Lyon | |
| Champion |
 Rainer Schüttler
|
| Runner-up |
 Arnaud Clément
|
| Final score | 7–5, 6–3 |
Paul-Henri Mathieu was the defending champion but lost in the first round to Rainer Schüttler.
Schüttler won in the final 7–5, 6–3 against Arnaud Clément.
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