World number 10 Aryna Sabalenka ground down former US Open champion Samantha Stosur to give Belarus a 1-0 lead in their Fed Cup semi-final against Australia in Brisbane on Saturday. The 20-year-old needed 2hrs 47mins to get past a player 15 years her senior 7-5, 5-7, 6-3 ahead of the second rubber between world number nine Ashleigh Barty and two-time Grand Slam winner Victoria Azarenka. "It was an unbelievable match. She played so quick I couldn't touch the ball at times but when you're playing for your country, you have to fight to the end." Sabalenka told.