Rock, who also returns kickoffs for the Knights, is the first to admit that he's not doing it by himself. A sizable offensive line led by seniors Donnie Knox and Ryder Cavey has blocked well for the 5-8 Rock, who hits the hole quickly and uses his speed to get outside.
"With our line, we not only have size and strength but also technique," said Rock. "They are very strong on the fundamentals. I tell them before every game that if they block for me, I'll get the yards and the touchdowns and we'll win the game."
While Rock has picked up the lion's share of yardage, his backfield running mate, junior Mike Ashwell, has gained more than 500 yards in seven games. That's not a surprise to their offensive linemen.
"I expected to have a 1000-yard rusher and a backup running back that would run all over the field," said Knox, a four-year starter who lines up at offensive tackle and defensive end.
Cavey believes that Rock's off season experience with rugby enhanced his teammate's improvement as a football player.
"I think that really helped with his field vision," said Cavey, a three-year starter on the offensive and defensive lines. "Instead of just hitting the hole and trying to dart into the end zone, he's become a much more patient runner who waits for something to open up and uses his speed to accelerate past people. His agility and his footwork are unlike anyone that I've ever played with, and (that) sets him apart from any of the backs that we've played this season."
Rock also credits rugby for boosting his conditioning during the time he was away from his favorite sport.
"I had to stay in shape," Rock said. "Rugby helped me improve my quickness and my vision, and since there are no blockers in rugby I learned to look for the seams where I could run.
"To score in rugby, I had to make one move inside and then go outside, and the majority of my touchdowns have come because of that technique."
Rock's production is a main reason that the Knights are averaging 30 points per game. That output eases the pressure on Century's defensive.
"Even in our practices, Tyrice is really hard to tackle," said senior middle linebacker Matt Pluta, who had a key fourth-quarter interception against Manchester Valley. "He gets to the top speed so quickly. He'll break through any arm tackles, and then dart outside and outrun anybody."
Rock knows that the records are there for the taking, but his main goal is leading Century to the playoffs.
The Knights reached the Class 2A state semifinals in 2008, and followed with a second consecutive county title and regional playoff appearance the next year. But Century lost to South Carroll in a 2009 first-round playoff game, and missed the postseason the last two years.
"If we keep playing the way we are now, we will have a shot," Rock said. "I believe that we'll make it, because we're all united and have good chemistry as a team."