World number one Jannik Sinner reached his first grass final at the Wimbledon tune-up tournament in Halle, Germany, while home favourite Alexander Zverev was defeated by Hubert Hurkacz. Sinner was made to work for a 6-4, 7-6 (7-3) semi-final victory against Zhang Zhizhen on Saturday. His best previous result on grass was a semi-final showing last year at Wimbledon, which he lost to Novak Djokovic. “It means a lot. I had four very tough matches to go to the final,” he said. “It was a good match today. Definitely more rallies than yesterday and that’s exactly what I needed today. I’m happy and l…