"The first night, just throwing a steer down in Las Vegas is living a dream," he said. "To be here now after winning has been a goal since I was a kid."
Lewis has finished among the top six in four rounds and bumped his season money total to $81,682.
"Rodeo is not an individual sport," Lewis said. "My family has sacrificed. My wife. I have kids at home. ... You have traveling partners. It takes so many people to get here, and they've all sacrificed. So it means a lot."
Meanwhile, two Utah cowboys moved within one round of winning world championships.
In bareback, neither Caleb Bennet of Morgan nor Kaycee Feild of Payson finished in the money. Bennett posted a score of 79.5 and Feild scored a 76.5, although he remained on track for his second straight world title.
Feild leads Will Lowe of Canyon, Texas, by almost $40,000. He also continues to lead Lowe in the average.
The bottom line?
If Feild completes his eight-second ride in the 10th round Saturday night, he probably can't be caught.
In saddle bronc, Milford's Cody Wright finished second with a 78 and earned $14,429.
His brother, Jesse Wright, did not place after posting a score of 75.5. But he still leads Wade Sundell of Boxholm, Iowa, by more than $45,000 in the world standings.
In other events, Spanish Fork's Clint Robinson tied for first in tie-down roping with a time of 6.9 seconds, Hooper's Kelli Tolbert did not place in barrel racing, and Tag Elliott of Thatcher failed to score in bull riding.
National Finals Rodeo highlights
R Lehi's Tom Lewis wins the steer wrestling in Round 9 of the Wrangler National Finals Rodeo with a time of 3.5 seconds.
• Payson's Kaycee Feild and Milford's Jesse Wright continue to lead the world championship race in bareback and saddle bronc, respectively.
• Spanish Fork's Clint Robinson ties for first place in the tie-down roping and keeps his slim world title hopes alive.
P The last day of NFR is Saturday at the Thomas & Mack Center in Las Vegas