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Arthur Fils and Alexander Zverev clashed during a tense and dramatic Hamburg European Open final on Sunday. World No 4 Zverev - who was born in Hamburg - was facing off against the 20-year-old Frenchman hoping to make it back-to-back titles in his home city. Fils won the first set, before Zverev fought back, but the flashpoint came in the deciding set. With the score at 5-5 and Fils a break point down, he unleashed a controversial underarm serve, which infuriated Zverev.