It was the earliest pick-six in Bears history since records were first kept in 1978. In 2014, safety Ryan Mundy returned an interception for a touchdown 23 seconds into the game. Edwards crossed the goal line 15 seconds into Sunday night’s game.

When Purdy plays like this, he infuses an intoxicating aura into his team. And now, improbably, the 49ers are one win from the No. 1 seed.

Preview the NFL week 18 matchup between the Seattle Seahawks and 49ers, including betting odds, tips, trends, and game information.

Gardner-Johnson intercepted Brock Purdy’s pass in the second quarter with the game tied at 21. The pick came back, though, when Gardner-Johnson was called for illegal use of hands when he made contact with receiver Ricky Pearsall. That gave the 49ers the ball at the Bears’ 3. The 49ers scored two plays later on a three-yard Purdy run.

Brock Purdy threw for 303 yards and three touchdowns as San Francisco is now one win away from earning the NFC's top seed.

Get a prediction, pick and odds for the NFL Week 18 matchup between the Seattle Seahawks and the San Francisco 49ers.

Seattle and San Francisco will decide the NFC West in Week 18. Check our NFL odds series for the Seahawks-49ers prediction and pick.

No NFL offense has been hotter as of late than that of the San Francisco 49ers, and it's been due in large part to the play of quarterback Brock Purdy