Big plays were the way Saturday 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 at Nottingham Field in Greeley. Cal Poly’s victory in front of more than 4,000 fans spoiled UNC’s homecoming festivities in the Big Sky Conference opener for both teams.