TOKYO, July 27 (Reuters) - Tom Dean powered to the gold medal in the men"s 200m freestyle at the Tokyo Olympics on Tuesday, heading a British one-two with Duncan Scott taking silver. Dean won in a time of 1:44.22 with Scott was just four hundredths of a second behind him. Fernando Scheffer of Brazil took bronze. South Korea"s Hwang Sun-woo was under the world record time at the 100m mark but faded badly, ending up seventh, as the British pair powered towards a spectacular finish. The 21-year-old Dean"s gold was Britain"s second in the Tokyo pool after Adam Peaty"s success in the 100m breaststroke on Monday. "I knew it was going to be a dogfight, I didn"t know how people were going to swim it, just race the race and that"s how it is," said a delighted Dean. Scott was narrowly above Dean in the rankings coming into the Games and qualified fastest, but was delighted for his team mate. "Just a massive credit to Tom Dean. That was unbelievable. Olympic champion," he said. "To come along so far in the last 18 months, it"s a pleasure to watch him. It"s great to be able to say he"s a good mate out of the pool." It is the first time since 1908 that two male British swimmers have finished on the Olympic podium together.