Mauney earned 92 points on Grand Slam to claim $5,500, bringing his Pool B aggregate total to $8,000.
"There were a few times I thought I was going to hit right on the back of his head," said the 26-year-old. "Luckily it worked out. He kept changing it up, it wasn't real even. He'd step forward, and then he'd back-up underneath me. He made me guess, and made me work for it."
Mauney is coming into Calgary after a break of several months from bull riding to heal from broken ribs. He won the big cheque — $100,000 — in bull riding at Calgary in 2009.
"I was pretty young then,"he said. "You kind of get to going, like, 'Ahh. I'll never see another broke day.' The older you get, the more injuries you start getting, and you feel it a lot more.
"Any time you win a big cheque like this, it's amazing. I'm married now, and have a daughter, so a hundred thousand would be a nice down payment on a new house."
In bareback, Clint Laye made the most of a re-ride and the result was an 89.5, and $5,500 for first place.
"I'm really grateful they gave me another chance," said the 19-year-old Laye. "There's so much money here, and I want it so bad. I want to do as best as I can, and I want to have the best shot."
Dusty LaValley of Bezanson, Alta., is on top of Pool B with $9,500. He and Will Lowe split second Wednesday with marks of 85.5.
In the tie-down roping, Hunter Herrin of Oklahoma was the fast man with a time of seven seconds flat, for the $5,500. But Adam Gray was next in line with a time of 7.7 seconds, so he leads overall with $10,000.
In steer wrestling, Matt Reeves' 3.6 seconds proved to be best of the bunch, so he won the $5,500 for the day. However, Redcliff's Zane Hankel has placed deep in both rounds, and is the Pool B leader with $6,500.
Barrel racer Sherry Cervi piloted her horse Stingray around the barrels in 17.33 seconds, the fastest posted so far at the Stampede. The Arizona cowgirl leads Pool B with $10,000.
In saddle bronc, Minnesota's Tyler Corrington spurred to an 87 on Hot Flash to pick up his second straight go-round win. His $11,000 in winnings are at the head of the Pool B pack.