Birk Ruud of Norway has become the first Olympic champion in the men’s freestyle big air, taking gold at the Beijing Winter Games on Wednesday. The 21-year-old earned the highest score of 95.75 on his first run at the new Big Air Shougang venue. His two best scores put him top of the standings on 187.75. American Colby Stevenson, 24, claimed silver with a score of 183.0. Sweden’s Henrik Harlaut, 30, took bronze with a total of 181.0. He saved his best for his last run, knocking his countryman Oliwer Magnusson off the podium. The win marks the first Olympic medal for Harlaut, who is competing i…