Olympic bronze medallist Walter Dix sounded his own warning ahead of this summer’s London Olympic Games with a wind-aided 9.85 seconds to take the invitational 100m at the 2012 Mt. SAC Relays on Saturday. The American was pushed slightly by a wind of +2.4 m/s, but his move in the second part of the race shows that his training is right on schedule for the busy summer. Dix made a decision to switch...