SANTA CLARA – Here is how the 49ers (3-0) graded in Sunday’s 16-15 win over the Arizona Cardinals (2-1) in their home opener:

PASS OFFENSE: B+

Mac Jones aggravated a month-old knee sprain but engineered a two-minute drive that yielded the 49ers’ walk-off field goal. Jones also shook off two fourth-quarter gaffes he blamed on himself: an interception at Arizona’s 20-yard line, and then a safety on the ensuing possession in which Calais Campbell swam past Dominick Puni for a holding penalty in the end zone. Jones relied too heavily on two targets – Christian McCaffrey (10 catches, 15 targets, 88 yards) and Ricky Pearsall (eight catches, 11 targets, 117 yards – but the 49ers were down, let’s see, George Kittle, Brandon Aiyuk, Jauan Jennings, Demarcus Robinson, Jordan Watkins, etc. Pearsall’s 34-yard, fourth-and-2 catch at the 6-yard line set up Jones’ only touchdown pass — a 1-yard grenade on a play-action bootleg to Kyle Juszczyk. Sacked once all game, Jones completed passes to four different receivers – Jake Tonges, Skyy Moore, Kendrick Bourne, McCaffrey – on the winning drive. Cue: Brock Purdy, next Sunday against Jacksonville.

RUN OFFENSE: D

McCaffrey struggled to find room on his 17 carries for 52 yards. Brian Robinson relieved him for just two carries, but one resulted in a 19-yard gain on a potential go-ahead drive halted by Jones’ interception four snaps later. McCaffrey got stopped for no gain on the snap before the interception; it was the 49ers’ final run. Rookie guard Connor Colby’s starting debut saw him called for a holding penalty to nullify a 7-yard run by McCaffrey on the first snap after halftime.

PASS DEFENSE: C+

Third-down pass breakups by Fred Warner and Upton Stout halted the Cardinals’ final two possessions. Earlier, Renardo Green’s pass-interference penalty in the end zone set up Kyler Murray’s lone touchdown pass, that being a 1-yarder to Trey McBride against Dee Winters. The 49ers have no interceptions through three games, and Warner had one slip through his hands while also wishing he had snatched that aforementioned third-down throw.

RUN DEFENSE: A-

Murray scooted his way for just 37 yards on six carries. The biggest run stop came when Marques Sigle injured James Conner’s ankle on the Cardinals’ second play after halftime. Conner had just 22 yards on nine carries, while upstart back Trey Benson had 10 carries for 42 yards, 29 of which came on one run. Warner racked up 11 tackles for the second straight game and Winters had eight. Chalking up tackles-for-loss were Bryce Huff, Deommodore Lenoir, Jordan Elliott and Mykel Williams, whose came after he returned from a second-quarter wrist injury.

SPECIAL TEAMS: A

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The kicker, Eddy Piñeiro, did his job. He made all three field-goal attempts and a lone point-after kick. Sounds simple. It hadn’t been with his predecessor, Jake Moody. Once Piñeiro made the 35-yard winning field goal as time expired, the 49ers found themselves as the NFC West’s only unbeaten team. As for other special teams issues, Skyy Moore probably should not have made a fair catch at the 6 on the Cardinals’ final punt, as it set up a safety, but he did have kick returns of 31 and 30 yards.

COACHING: A

Ratatouille — defined as a humble, rustic vegetable stew — is an apt culinary metaphor. Kyle Shanahan cooked up another win. Third in three tries. Second via a fourth-quarter comeback, third with fourth-quarter heroics. This is not Shanahan’s signature style. Injuries be damned. The Niners are undefeated. Their stadium hosts the Super Bowl on Feb. 8. Commissioner Roger Goodell was on site to verify that Sunday — Levi’s Stadium as a Super Bowl site, and perhaps the 49ers as an actual contender.