Venus and Klaasen set up a quarter-final against the Murray brothers in the ATP tournament at Washington DC.
New Zealand's top ranked doubles player Michael Venus and South African partner Raven Klaasen have made a start to their North American hardcourt campaign and will next face Andy and Jamie Murray for a place in the semifinals.
The third seeds have beaten the French Open champions Kevin Krawietz and Andreas Mies of Germany, 6-3 3-6, 10-7 in the match tie break to reach the quarter finals at the ATP 500 tournament in Washington DC.
Venus and Klaasen led 8-3 in the match tie break before the Kiwi double faulted to hand the German pair a lifeline. They got back to 8-7 before Klaasen won his next two service points to secure the win in 1 hour and 10 minutes.
Andy Murray is teaming up with his brother Jamie as he continues his comeback from hip surgery. The British brothers had a straight sets win over the French pair of Nicolas Mahut and Edouard Roger-Vasselin.