* Federer and Wawrinka put Swiss 2-0 ahead against Serbia * Kohlschreiber and Mayer give Germany lead over Spain * France dominate Australia, Czech holders level with Dutch (writes through with later results, adds byline) By Toby Davis LONDON, Jan 31 (Reuters) – Roger Federer and Stanislas Wawrinka gave Switzerland a 2-0 lead over last year’s runners-up Serbia while injury-hit Spain trailed Germany by the same margin as the Davis Cup World Group first-round ties got underway on Friday. Serbia fielded a second string team without world number two Novak Djokovic, two months after they lost to the Czech Republic in the final, and were quickly under pressure in Novi Sad.

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