49ers at Kansas City Chiefs

Patrick Mahomes threw for 314 yards and three touchdowns and the Kansas City Chiefs beat the 49ers 38-27 at Arrowhead Stadium. Garoppolo tore his ACL in the third quarter scrambling for a first down. C.J. Beathard came in cold. Tyreek Hill caught a 75-yard TD pass. Kareem Hunt ran for 86. Matt Breida ran for 73. The 49ers fell to 1-2 with the season-changing injury.[1][2][3]

Jimmy Garoppolo tore his ACL Sunday afternoon at Arrowhead Stadium. The 49ers' starting quarterback, who had played the franchise's late-2017 5-0 run in the role of savior, scrambled for a first down in the third quarter and went down without contact. The kind of in-game injury that, in real time, ended his season and substantially altered the franchise's 2018 trajectory.

The Chiefs won 38-27. Patrick Mahomes threw for 314 yards and three touchdowns including a 75-yard score to Tyreek Hill. C.J. Beathard came in cold and threw for 95. Matt Breida ran for 73.

The kind of cross-conference Sunday afternoon loss that, beyond the box score, defined the year's competitive trajectory. The 49ers' Niners' rebuild push is now Beathard's offense for the back half. 1-2 with the Chargers coming up next on the road.

Chiefs 38, 49ers 27. Margin: -11. Three-game record: 1-2, -16 differential.

• Garoppolo: torn ACL in Q3 (season-ending non-contact injury on scramble).
• C.J. Beathard: cold-relief; 8-of-15 for 95.
• Garoppolo (before injury): 18-of-24 for 251, 2 TDs.
• Patrick Mahomes: 24-of-39 for 314, 3 TDs.
• Tyreek Hill: 75y TD reception.
• Kareem Hunt: 18 carries for 86.
• Matt Breida: 9 carries for 73.
• 49ers 1-2 (Garoppolo season ended); Chiefs 3-0.

A 38-27 loss at Arrowhead Stadium and the season-ending ACL injury to Jimmy Garoppolo. The 49ers fall to 1-2.

How it unfolded

Garoppolo led a touchdown drive opening with a long throw to Goodwin. The Chiefs answered. Mahomes threw a 75-yard touchdown to Tyreek Hill. The 49ers added a field goal. Garoppolo threw a touchdown to Marquise Goodwin to make it 14-10. The Chiefs scored again. In the third quarter, Garoppolo scrambled for a first down and went down without contact on his left knee. C.J. Beathard came in cold. The Chiefs extended the lead to 38-20. Beathard added a late touchdown to make the final 38-27.

The turning point

Garoppolo's third-quarter scramble that ended in the season-ending ACL injury. The kind of single-play in-game injury that altered the franchise's 2018 trajectory.

By the numbers

Garoppolo before injury: 18-of-24 for 251 with two TDs. Beathard in relief: 8-of-15 for 95 with a TD. Mahomes 24-of-39 for 314 with three TDs. Hill 5 catches for 90 with the 75-yard TD. Travis Kelce 4 catches for 78. The Chiefs' offense produced 38 points.

Personnel watch

Garoppolo's season-ending ACL was the day's only story by the time the game ended. Mahomes in his third start producing his third 300-yard game. The 49ers' year-two QB1 project is over after 25 starts. Beathard takes over for the rest of 2018.

What it means

1-2 with the Chargers on the road next week and Beathard the starting quarterback. The cross-conference loss became the season's defining moment when Garoppolo went down without contact. The Niners' Niners' second-year identity is now about whether Beathard can keep the offense functioning at any kind of level for the remaining 14 games.