Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Round | Date | Grand Prix | Circuit | 125cc winner | 250cc winner | MotoGP winner | Report |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | 9 March | Qatar Grand Prix ‡ | Losail | Sergio Gadea | Mattia Pasini | Casey Stoner | Report |
| 2.0 | 30 March | Spanish Grand Prix | Jerez | Simone Corsi | Mika Kallio | Dani Pedrosa | Report |
| 3.0 | 13 April | Portuguese Grand Prix | Estoril | Simone Corsi | Álvaro Bautista | Jorge Lorenzo | Report |
| 4.0 | 4 May | Chinese Grand Prix | Shanghai | Andrea Iannone | Mika Kallio | Valentino Rossi | Report |
| 5.0 | 18 May | French Grand Prix | Le Mans | Mike di Meglio | Alex Debón | Valentino Rossi | Report |
| 6.0 | 1 June | Italian Grand Prix | Mugello | Simone Corsi | Marco Simoncelli | Valentino Rossi | Report |
| 7.0 | 8 June | Catalan Grand Prix | Catalunya | Mike di Meglio | Marco Simoncelli | Dani Pedrosa | Report |
| 8.0 | 22 June | British Grand Prix | Donington | Scott Redding | Mika Kallio | Casey Stoner | Report |
| 9.0 | 28 June | Dutch TT | Assen | Gábor Talmácsi | Álvaro Bautista | Casey Stoner | Report |
| 10.0 | 13 July | German Grand Prix | Sachsenring | Mike di Meglio | Marco Simoncelli | Casey Stoner | Report |
| 11.0 | 20 July | United States Grand Prix | Laguna Seca | No 125cc and 250cc race | No 125cc and 250cc race | Valentino Rossi | Report |
| 12.0 | 17 August | Czech Republic Grand Prix | Brno | Stefan Bradl | Alex Debón | Valentino Rossi | Report |
| 13.0 | 31 August | San Marino Grand Prix | Misano | Gábor Talmácsi | Álvaro Bautista | Valentino Rossi | Report |
| 14.0 | 14 September | Indianapolis Grand Prix | Indianapolis | Nicolás Terol | Race cancelled | Valentino Rossi | Report |
| 15.0 | 28 September | Japanese Grand Prix | Motegi | Stefan Bradl | Marco Simoncelli | Valentino Rossi | Report |
| 16.0 | 5 October | Australian Grand Prix | Phillip Island | Mike di Meglio | Marco Simoncelli | Casey Stoner | Report |
| 17.0 | 19 October | Malaysian Grand Prix | Sepang | Gábor Talmácsi | Álvaro Bautista | Valentino Rossi | Report |
| 18.0 | 26 October | Valencian Grand Prix | Valencia | Simone Corsi | Marco Simoncelli | Casey Stoner | Report |
Question:
Name the circuit for round 18
Answer:
Valencia