AUCKLAND, New Zealand -- Gael Monfils has withdrawn from next week's Heineken Open ATP tennis tournament in Auckland, citing fatigue.

The 31st-ranked Frenchman, who was to be the tournament's seventh seed, told organizers Sunday he would be unable to play after losing to Rafael Nadal in three sets in the final of the Qatar Open.

Fourth-seeded South African Kevin Anderson is also an uncertain starter after pulling out of the Brisbane International with a virus which caused him to spend two nights in hospital. He is not due to play his first singles match until Wednesday.

Third-seeded American John Isner has an ankle injury and has told organizers he will provide them with a fitness update later Sunday.