Dak Prescott has played just two preseason games but you certainly wouldn't know it to watch him.

Against the Rams last week, the fourth-rounder started his first-ever professional game and finished 10 of 12 with 139 yards and two touchdowns. Against the Dolphins on Friday night, he was even better. He relieved Tony Romo after two series and when it was over, the rookie was 12 of 15 for 199 yards with two more touchdown passes along with two rushing touchdowns.

If you're looking for one stat to encapsulate just how good he's been, this is it:

That's right: six touchdowns and just five incompletions.

If someone told you that Prescott was the fourth-overall pick, and not a fourth-round pick you'd believe it without hesitation, right? But despite the unexpected success, it's Cowboys owner Jerry Jones who cautions against setting unreasonable expectations.

"I don't want to get ahead of things here," Jones said after Friday's preseason win over the Dolphins, via the Fort Worth Star-Telegram. "I like what we're getting a chance to do to get these young guys, these quarterbacks, snaps. These are just invaluable to be able to get those snaps under that scenario, that competition.

"So I wouldn't want to disturb that as we look to these next two preseason games at all. I'd like to see these young guys get the snaps."

It wasn't long ago that the Cowboys lost veteran backup Kellen Moore to an ankle injury and the concern was that there wouldn't be a proven backup behind Romo. A year ago, the results were disastrous; Brandon Weeden, Matt Cassel and Moore combined to go 4-12 and Romo spent much of the season sidelined with a shoulder injury. But such fears have been allayed, at least for the time being, thanks to Prescott's surprising start.

But again, Jones -- of all people! -- is preaching patience.

"Let's don't get ahead of ourselves here," the owner continued. "That would be a mistake. We are in a situation where we can have a developing -- but adequate -- because of the excellence of Tony Romo, we can have that behind him. To me that's what you're ideally striving for. What we've seen so far in these first two preseason games does make you look positively toward his progress."

Meanwhile, Prescott seems right at home in the NFL.

"I feel great," he said. "I'm very confident in myself. That hasn't changed from the moment I was drafted. "My mindset is to come in each and every day and do the best I can."

And despite Jones' reservations, Dez Bryant, who has hauled in two Prescott touchdowns, is duly impressed.

"The guy's pretty amazing," Bryant said. "We just gotta keep being there for him. He's a smart guy and one hell of a football player."

There will come a time, of course, when Prescott struggles. This isn't an indictment against him or his abilities, but the realities of life in the NFL.

In the meantime, enjoy what Prescott is doing because it doesn't happen often.