NEW YORK: Third-ranked Jessica Pegula shook off nerves that contributed to a slow start against Elena-Gabriela Ruse, winning her opening match at the US Open on Sunday in straight sets.Leading off at Arthur Ashe Stadium, the 32-year-old American missed her first nine opportunities to break Ruse but found a rhythm and began dominating. Coming off a trip to the final at the Cincinnati Open, which she lost to Coco Gauff, Pegula won 92 percent of her first-serve points on the way to a 6-3, 6-2 victory in 83 minutes.“I was so nervous,” Pegula said. “I was like sending GIFs of what I felt like.