Jurgen Melzer suffers Stuttgart upset

Second seed Jurgen Melzer suffered a first-round exit from the Mercedes Cup in Stuttgart as he was beaten 6-4 7-5 by Colombian Santiago Giraldo.

In further surprises, German fifth seed Florian Mayer was beaten 6-2 6-3 by Argentinian qualifier Federico Del Bonis, and sixth seed Nikolay Davydenko went down 3-6 6-1 6-4 to home wild-card Cedrik-Marcel Stebe.
Third seed Mikhail Youzhny did advance with a 6-3 6-3 win over Germany's Philipp Petzschner, and former world number one Juan Carlos Ferrero beat German lucky loser Bastian Knittel 6-2 6-4.
Fabio Fognini made routine progress with a 6-4 6-1 win over Germany's Robin Kern and, on a disappointing day for home fans, Tobias Kamke and Mischa Zverev were beaten by Jeremy Chardy and qualifier Pavol Cervenak respectively.
Chardy's fellow Frenchman Benoit Paire came from a set down to beat Russian Evgeny Donskoy 6-7 (3/7) 6-4 6-2, Spain's Pablo Andujar cruised past Romanian Victor Crivoi 6-2 6-1 and Lukasz Kubot beat Daniel Gimeno-Traver 7-6 (7/2) 3-6 6-2.