The former world number one tennis player Roger Federer has been stunned by Argentine qualifier Federico Delbonis, the world number 114, in the semi finals of the Hamburg claycourt tournamament.
The 17-time Grand Slam title winner was defeated 7-6 (9-7) 7-6 (7-4) by the 22-year-old Delbonis with the defeat coming just a month after Federer was knocked out of Wimbledon in the second round.
Delbonis will play Fabio Fognini in the final after the Italian 12th seed reached his second successive final by beating Spain's Nicolas Almagro 6-4 7-6 (7-1).
Debuting a larger racquet frame this week, Federer had twice been pushed to three sets on his way to the semi-finals.
