(Photo credit: Raymond Carlin III-Imagn Images)Jayden Pierre hit the go-ahead 3-pointer with 48 seconds to play to lift TCU to a 62-55 upset of No. 5 Iowa State in a Big 12 Conference clash on Tuesday in Fort Worth, Texas.Micah Robinson and Tanner Toolson each scored 17 points to lead the Horned Frogs (15-9, 5-6 Big 12). Pierre added nine points as TCU won its second straight game.Joshua Jefferson