Nieminen shocked by Istomin

Sixth seed Jarkko Nieminen suffered a shock defeat to Denis Istomin of Uzbekistan in the first round of the Dusseldorf Open on Tuesday.

Despite taking the first set, the 32-year-old Finn, who reached the final at last year's event where he was eventually beaten by Juan Monaco, suffered a 6-7 (5/7) 6-3 6-2 loss to Istomin in just under two hours.

World number 41 Monaco of Argentina saw off Benjamin Becker with a comfortable 6-2 6-1 victory to set up a second-round clash with Spanish second seed Marcel Granollers, who received a bye.

Russia's Nikolay Davydenko progressed thanks to a straight-sets victory over Dudi Sela of Israel. The former world number three moved past Sela with a simple 6-3 6-1 win in 60 minutes.

Qualifier Mate Delic of Croatia reached the second round thanks to a hard-fought 7-5 7-5 triumph over Poland's Michal Przysiezny.

The one outstanding first-round match, between qualifiers Alessandro Gianessi and Jason Kubler, was suspended at one set all due to bad light. The pair will resume first on court three on Wednesday, with the winner to face Istomin later in the day.