SEATTLE – Here is how the 49ers graded in Sunday’s 17-13 season-opening win over the host Seattle Seahawks:

PASS OFFENSE: B

Brock Purdy threw touchdown passes on both their first and last possessions. Do those cancel out his two second-half interceptions? No, but he’s paid ($53 million per year) to deliver wins, and he came through in the clutch, completing all six of his passes for 67 yards on the game-winning drive that culminated in a 4-yard prayer to Jake Tonges.

Purdy’s protection wasn’t great, but he got sacked just once, when a blitzing safety slipped past Christian McCaffrey. It was no surprise Purdy capped a 14-play, 95-yard opening drive with a 5-yard scoring strike to Kittle. But once Kittle left with a hamstring, the 49ers needed others to step up, and seven others indeed made catches, each seemingly vital in this comeback but in particular McCaffrey (nine catches, 73 yards) and Ricky Pearsall, who had a 45-yard gem on the winning drive to highlight his four-catch, 108-yard day. Kudos also to Tonges, Kyle Juszczyk, Luke Farrell, Brian Robinson and Jauan Jennings, who had a signature third-and-Jauan conversion but also now has a shoulder injury.

RUN OFFENSE: B

Any 36-carry, 119-yard compilation deserves praise. This one came after days of concern over McCaffrey’s calf. The longest runs by McCaffrey (13 yards) and new backup Brian Robinson Jr. (9 yards) came on the 49ers’ game-tying drive to open the fourth quarter. McCaffrey’s predictably heavy workload included 22 carries (69 yards) while Robinson spelled him for nine carries (33 yards). McCaffrey converted on their first four short-yardage plays, but he got stuffed on his final three, and Robinson lost a yard on his second-and-1 try. Purdy’s mobility resulted in five carries (17 yards). Trent Williams and Dominick Puni played through injuries.

PASS DEFENSE: A-

Renardo Green may have allowed a 40-yard, last-minute catch that put the 49ers’ win in jeopardy, but Nick Bosa bailed him and the entire defense out with a strip-sack fumble recovery with 36 seconds remaining. If this wasn’t the best play of Bosa’s accomplished career, it was the most timely, as he powered right tackle Abraham Lucas into Darnold, forcing the fumble that Bosa recovered. It was the 49ers’ lone sack on Darnold (16-of-23, 150 yards). Another takeaway came when Sam Okuayinonu forced Jaxon Smith-Njigba to fumble in 49ers territory, with Marques Sigle recovering to open the fourth quarter and spark a rally. Not so great: penalties, on Deommodore Lenoir (unnecessary roughness, unsportsmanlike conduct), Upton Stout (pass interference in the end zone, setting up the Seahawks’ only touchdown) and Green (holding on third down).

RUN DEFENSE: A

The Seahawks may be trying to mirror a run-oriented, Shanahan-esque scheme, but they didn’t get positive results against a 49ers team that had major problems stopping the run last season. Seattle averaged just 3.2 yards per carry. Zach Charbonnet (12 carries, 47 yards, 1-yard touchdown) and Kenneth Walker III (10 carries, 20 yards) were ineffective, although Charbonnet’s incidental kick into Fred Warner’s face literally sparked a bloody fury (team-high eight tackles). The 49ers totaled seven tackles for loss – three from Bosa, two from Dee Winters and one each by Warner and Kalia Davis.

SPECIAL TEAMS: D-

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Jake Moody and the field-goal unit flunked their first-half performance, with Moody shanking a 27-yard try off the left upright before a protection gaffe got his next attempt blocked from 32 yards. Ah, but Moody made a game-tying, 32-yard field goal in the fourth quarter. Skyy Moore muffed one punt, but he returned the Seahawks’ final kickoff 24 yards so the 49ers’ winning drive could start at the 32. Isaac Guerendo, in his only touch of the day, muffed the second-half kickoff and returned it only to the 20-yard line.

COACHING: B

Wins won’t be easy this season, and this Week 1 escape exemplified that. Shanahan drew praise from Purdy and Pearsall for dialing up the 45-yard connection that sparked the winning drive. Robert Saleh started his second act as defensive coordinator with widespread praise, too.