Muller safely through in Belgrade

Muller defeated his Slovakian opponent as a host of other seeds fell in Serbia.

Fabio Fognini , seeded sixth, lost 6-1 6-4 to Benoit Paire , while seventh seed Ryan Harrison was defeated 6-3 6-3 by Brazil's Joao Souza .

Fifth seed Lukasz Kubot fell 7-5 6-2 to Lukas Rosol of Czech Republic.

Victor Hanescu did make it through to the second round though, the Romanian beating Spain's Carlos Gomez 6-2 5-7 6-3.

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