TOKYO, Aug 5 (Reuters) - American Katie Nageotte needed a third and final attempt to clear her opening height but overcame the nervous start to win the Olympic women"s pole vault gold medal on Thursday. The 30-year-old arrived in Tokyo in red-hot form with two world-leading marks of 4.95 metres and 4.93, but she struggled to get over 4.50 to register her opening mark in the final. "It was the worst warm-up I have had in a long time and I did an ugly first few jumps," she said. "It took me a few heights to get into it, but I was just fighting and I finally found a smooth jump. It came together."