SAN FRANCISCO (AP) — As Alex Smith stood on the sideline with a concussion, San Francisco's potential quarterback of the future went to work — and fast.
Strong-armed fill-in Colin Kaepernick made all the right throws, looking every bit a capable NFL No. 1.
Kaepernick passed for 243 yards and two touchdowns in his first career start in place of the injured Smith, and the 49ers whipped the Chicago Bears 32-7 on Monday night in a highly touted NFC showdown that hardly lived up to the hype.
"It's everything I could've ever wished for," Kaepernick said. "It feels great just to be out there."
Kaepernick threw touchdown passes to Vernon Davis and Michael Crabtree, and Kendall Hunter ran for a 14-yard score as San Francisco (7-2-1) jumped out to a big lead by scoring on each of its first four possessions — with Aldon Smith wreaking havoc on the other side of the ball with 5½ sacks.
Jason Campbell, the other quarterback in this matchup of backups for division leaders, threw a 13-yard touchdown pass to Brandon Marshall in the third quarter but was sacked five times and threw two interceptions in his first start since October 2011 for Oakland.
He faced fierce pressure all night, on the field for the Bears (7-3) as starter Jay Cutler recovers from a concussion suffered eight days earlier — just like Alex Smith.
After Kaepernick's stellar night on the big stage, there's certain to be chatter of a quarterback controversy for the NFC West-leading Niners. And anyone who knows coach Jim Harbaugh knows he's all about competition — at every spot on the field.
"I usually tend to go with the hot hand, and we've got two quarterbacks with hot hands," he said. "We'll make that decision when we have to make it."
Aldon Smith took over the NFL sacks lead with 15, passing Denver's Von Miller with 13, and recorded the second-best total in franchise history behind Fred Dean's six-sack day on Nov. 13, 1983, against New Orleans. Tarell Brown and Dashon Goldson each had an interception for San Francisco's stingy defense, which shut down Campbell, Matt Forte and Co. three years after the teams last met in a 10-6 49ers home win.
"I think I have a thing for night games, I love playing at night," Smith said. "I love playing under the lights."
Kaepernick, Aldon Smith and Hunter sure made general manager Trent Baalke look good for his selections from the 2011 draft class.
And reigning NFL Coach of the Year Harbaugh earned a key victory four days after his own health issue. The 48-year-old Harbaugh underwent a minor procedure for an irregular heartbeat Thursday.
The 49ers added a safety in the fourth quarter after a replay review. With 9:24 left, former San Francisco offensive lineman Chilo Rachal was called for intentional grounding out of the end zone, but Harbaugh challenged and the review showed Rachal's knee was down in the end zone before the ball left.
"Tonight was probably the worst nightmare. We just have to find a way," Campbell said. "It's one game that we lost. We have to pick it back up next week and try to get back on the winning side. Our goals and everything still sit ahead of us."
The soft-spoken, stone-faced Kaepernick went 16 for 23 with a 133.1 passer rating. He completed 12 of his first 14 passes with a 57-yard strike to Kyle Williams that set up Davis' 3-yard TD on the next play — and he already had amassed 126 yards passing by the end of the first quarter.
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