At 4-0, Iowa State is off to its best start in 20-years but the challenge gets more difficult this week as second-ranked Nebraska invades Jack Trice Stadium. I-S-U coach Dan McCarney says while pleased with the start, this team is not one to rest on its laurels.McCarney says the key against Nebraska will be matching their strength up front.Ennis Haywood was named the Big-12 player of the week after a career high 241-yards and two touchdowns in Saturday’s victory over Baylor. McCarney says Haywood has developed into a feature back.