Top tennis players competing in the Watsons Water Champions Challenge have donated personal items for a charity auction to help Asian tsunami victims. It will be held tomorrow at Victoria Park, where the final will be played. The items include autographed racquets, towels and apparels belonging to Maria Sharapova, Serena and Venus Williams, Elena Dementieva, Svetlana Kuznetsova, Vera Zvonareva, Nicole Vaidisova and Arantxa Sanchez-Vicario. The organisers had earlier announced that they would donate $500,000 from the gate receipts to the Red Cross, which is conducting relief operations in the tsunami-affected areas. Spectators can make their contributions to donation boxes at Victoria Park Centre Court. The singles final will start at 2.30pm, followed by the doubles. On Wednesday, Russian glamour girl Sharapova made a disappointing start to the Hong Kong tournament when she was beaten 7-6 (7-2), 3-6, 1-6 by her compatriot Dementieva, last year's French and US Open finalist. Sharapova had a hard time concentrating on her game and a few bad calls by the linesmen did not help. She was also unhappy when a ball was thrown by a young fan as she was about to serve during the first set. 'I was worried about my safety. I want to protect myself,' she said. 'I have to feel safe to perform well.' Meanwhile, youngsters are welcome to attend a coaching clinic conducted by Sharapova, Dementieva, Sanchez-Vicario and Vaidisova today from 4.30-5.30pm at Victoria Park. Admission is free.