user: Question: List the rank of the player that left the tournament due to right foot injury
Columns: ['Rank', 'Player', 'Points', 'Points defending', 'Points won', 'New points', 'Withdrew due to']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'text']
Sample row: [5.0, 'Juan Martín del Potro', 5115.0, 720.0, 0.0, 4395.0, 'right wrist surgery']
SQL:

assistant: SELECT "Rank" FROM "Table" WHERE "Withdrew due to" = 'right foot injury';