user: Question: Name the round for John Van Lottum Martin Verkerk
Columns: ['Edition', 'Round', 'Date', 'Partnering', 'Against', 'Surface', 'Opponents', 'W/L', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2004 Davis Cup', '1R', '6–8 February 2004', 'Tommy Robredo', 'Czech Republic', 'Carpet (i)', 'Jiří Novák Radek Štěpánek', 'Lose', '6–4, 7–6 (8–6) , 6–3']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Opponents" = 'John Van Lottum Martin Verkerk';