user: Question: What is the highest grid for rider Fonsi Nieto?
Columns: ['Rider', 'Bike', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Noriyuki Haga', 'Yamaha YZF-R1', 14.0, '27:26.594', 4.0]
SQL:

assistant: SELECT MAX("Grid") FROM "Table" WHERE "Rider" = 'Fonsi Nieto';