Sporting KC defender Chance Myers (7) heads the ball past Portland Timbers defenders for a goal during the first half of an MLS soccer match in Kansas City, Kan., Saturday, April 27, 2013. (AP Photo/Orlin Wagner)

Wallace lifts Timbers past Sporting KC

Ryan Johnson had a goal and an assist for Portland (3-1-4), which extended its unbeaten streak to six matches and has won three of its last …