Kiwi doubles players Michael Venus and Marcus Daniell have both suffered surprise first round defeats at tournaments in the US and Europe.

French Open champions Venus and American Ryan Harrison have lost 6-4, 0-6, 10-7 in the Super tie break to an Argentine and Canadian team in the first round of the Atlanta ATP tournament.

Daniell and his Brazilian partner Marcelo Demoliner have lost 6-4, 6-7, 13-11 in the Super tie break to a Slovakian Portuguese combination at the ATP tournament in Gstaad, Switzerland.