By Mitch Phillips EUGENE, Ore. (Reuters) – Beating the Olympic champion to win a World Championship gold medal is a feeling few athletes get to experience but Jake Wightman is unique in doing it with his dad commentating on the race, live in the stadium. Father Geoff, also Jake’s coach, has been a fixture in athletics stadiums for decades and is long used to calling his son’s races and never reveals the familial connection. At the end of Tuesday’s 1,500-metre final though, even the tough old professional allowed himself a brief moment when he announced to the Hayward Field fans: “That’s my son…