The San Francisco 49ers are undefeated through three weeks despite starting quarterback Brock Purdy missing two games due to a turf toe injury. Backup Mac Jones playing well in his absence is a win-win for the organization.

While the San Francisco 49ers were attempting to win the game against the Arizona Cardinals, Mac Jones had to rely on Christian McCaffrey for help.

Jones threw an interception with the game tied in the fourth quarter against the Cardinals when he fired a pass downfield to Ricky Pearsall that was picked off by Dadrion Taylor-Demerson. A few minutes later San Francisco took a safety to fall behind, but Jones was able to lead a game-winning drive in the final minutes.

Now in his third act as an NFL quarterback, Jones has already had two opportunities to prove that he has good football left in him. In the process, the 49ers have learned a lot about their No. 2 signal-caller, even as Brock Purdy is poised to return from a toe injury sooner than later.

Carson Wentz and Marcus Mariota were sharp in leading their teams to lopsided wins as fill-in starters. Mac Jones overcame a costly turnover and engineered a game-winning final drive.

With Jauan Jennings missing from the lineup, Jones targeted either Christian McCaffrey or Ricky Pearsall on 26 of his 38 pass attempts.

San Francisco 49ers QBs Mac Jones and Brock Purdy discussed their approach heading into Week 4 against the Jacksonville Jaguars, talked about their recovery and preparation, and highlighted how they s

After being the 49ers' savior when Brock Purdy went down, Mac Jones has earned the chance to face his former team, the Jaguars, in Week 4.