SANTA CLARA, Calif. — The San Francisco 49ers had lost another star to an injury, given up a fourth-quarter lead on a safety and were relying on a backup quarterback and a brand new kicker to maintain their perfect start to the season.

Mac Jones and Eddy Pineiro delivered.

Jones calmly moved San Francisco down the field in the closing minutes to set up Pineiro’s 35-yard field goal on the final play that gave the 49ers a 16-15 victory over the Arizona Cardinals on Sunday.

“I failed a lot in that situation, to be honest, in the NFL,” said Jones, who was just 3-17 in his career in comeback chances before this win. “I just knew the guys had my back and like we talked about on the sidelines, go out there and rip it.”

Jones did just that and San Francisco (3-0) was able to overcome an injury

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