Two days after getting past Belinda Bencic for her first WTA main draw win since the Australian Open, Barthel fired eight aces and from 4-2 down in the second set won four straight games for a 6-2, 6-4 win over the eighth-seeded Beck. That put her into her first WTA quarterfinal since her run to the Paris [Indoors] title in February 2013.
"It was difficult against Annika," Barthel said. "You have to fight for every single point. But I served very well and that was the difference.
"Knowing each other well and getting along well off court makes it hard to play, but we are tennis pros and we have to manage that."
"Svitolina is a young, aspiring player, but I was able to beat her this year in Hobart," Barthel said of the WTA's highest-ranked teen.