Brock Purdy threw four touchdown passes as the injury-depleted San Francisco 49ers held on for a 36-30 win over the Arizona Cardinals at Levi's Stadium, according to the AP. San Francisco is 3-0 for the third time in four seasons.

The 49ers lost receiver Mike Evans to a rib injury in the first half and left tackle Trent Williams to a stinger in the second. Arizona rallied within reach behind Jacoby Brissett, who went 38-of-52 for 280 yards and 2 touchdowns. Purdy's 20-yard touchdown to George Kittle with 1:31 left and Deebo Samuel's onside-kick recovery sealed the win.

Purdy's 10 total touchdowns, passing plus rushing, are tied for the most in franchise history through three games, and he leads the league with a 133.1 passer rating. The game's first score came on an 82-yard hook-and-ladder from Evans to Samuel on third-and-12. Purdy finished 15-of-27 for 297 yards, 4 touchdowns and no interceptions.

"It's the NFL, it sucks when your teammates go down, but that's part of the game," Purdy said. Fred Warner added: "Brock is amazing. The offence is humming right now."

San Francisco's perfect start masks a growing injury list that will test their depth in the weeks ahead.