Sousa sails on as Becker prevails over Pospisil
Portuguese Joao Sousa looks to the sky during his second round tie match against Swiss Roger Federer at the ATP Gerry Weber Open tennis tournament in Halle, western Germany on June 12, 2014 - by Carmen Jaspersen
Sousa has benefited from the withdrawal of world number seven and 2012 David Ferrer, his scheduled first round opponent who pulled out with a stomach virus on the eve the tournament.
He will now face Germany's Benjamin Becker, who came back from a set down to defeat Canadian Vasek Pospisil 6-7 (3/7), 7-6 (7/5), 6-4 in a fiercely-contested match that was briefly interrupted by rain.
In the women's draw, Slovakia's Magdalena Rybarikova advanced to the last four with a 6-2, 7-5 win over Germany's Annika Beck.
Beck, who knocked out defending champion and world number four Simona Halep of Romania, came up short against the world number 39 who is chasing a fifth WTA title.
China's Zheng Jie awaits in the semi-finals after she crushed Ukraine's Elina Svitolina 6-3, 6-0.
And eighth seed Klara Zakopalova advanced easily by defeating Kazakhstan's Yaroslava Shvedova 6-2, 6-4.
She will take on American Coco Vandeweghe, who won a tense first set tie-break before prevailing 7-6 (7/3), 6-1 over Spaniard Garbine Muguruza.