SANTA CLARA – Mac Jones is grateful to finally have made his 49ers debut Saturday, but he won’t dwell on how things ended.

The San Francisco quarterback’s first drive in red and gold – and first of the game – resulted in a touchdown as he and the offense got going early. But things took a dramatic turn the rest of the way for Jones, as the offense didn’t gain more than 3 yards with him under center.

While 49ers coach Kyle Shanahan admitted it was frustrating that the offense didn't score any more points in their 30-9 preseason loss to the Denver Broncos, he's happy with how Jones performed overall.

“Mac seemed like he performed well,” Shanahan said postgame. “I liked how we came out. It was a challenge, especially going against that defense that had a bunch of guys out there, too. I

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