Big plays were the way for the Cal Poly football team. The Mustangs relied on four big plays — plays of at least 20 yards — to score two touchdowns and set up two more in a 28-7 Big Sky Conference win over Northern Colorado on Saturday at Nottingham Field in Greeley. Cal Poly’s victory in front of more than 4,000 fans spoiled UNC’s Homecoming festivities, and kept the Bears winless in five games this season.