“I've never in my whole life, this is unbelievable,” Elliott said. “This is something I'll remember the rest of my life.”
Keselowski was second, followed by Elliott’s Hendrick Motorsports Chevrolet teammate, Alex Bowman, and Tyler Reddick. Bowman helped block Keselowski following Elliott's last-lap pass.
“The 48 and 9 just got together,” Keselowski said, referring to Bowman and Elliott. “... At they end they were able to double-team me.”
Elliott climbed into the stands to celebrate with fans after ending a 44-race winless streak.
“I'm happy for the 9 team,” Bowman said. “It's a big win for him in his hometown. ... I'm glad to have a Hendrick car in victory lane. I wish it was us."
The race's second crash early in Stage 2 took out many of the sport's biggest names and left others with damaged cars. Pole-winner Joey Logano, who led the first 36 laps before light rain forced the first caution, was among the many drivers caught up in the big crash.
Among others knocked out of the race: William Byron, Austin Cindric, Ross Chastain, Josh Berry, Corey LaJoie and Daniel Suarez.
“It wrecked the whole field,” Logano said. “I still don't know exactly how it started ... but it was total chaos. Cars were sideways and on the brakes. I got hit from every corner possible.”
Added Denny Hamlin, who suffered damage to his Toyota in the crash: “Some zigged. Some zagged. Most crashed.”
The Atlanta race at EchoPark Speedway, formerly known as Atlanta Motor Speedway, was the debut of the 32-driver In-Season Challenge, a five-race, bracket-style tournament.
The parade of highly regarded drivers to be knocked out so early in the race showed the perils of trying to pick NASCAR winners on a March Madness-style bracket sheet. The top two seeds were among the early casualties.
Hamlin, the No. 1 seed in the tournament, finished 31st and lost to Ty Dillon, who finished eighth.
Chase Briscoe, who held off Hamlin for his first win for Joe Gibbs Racing last week at Pocono Raceway, was the No. 2 seed before being knocked out in a crash and losing to Noah Gragson in the tournament.
A $1 million prize awaits the winner as part of a new media rights deal that includes TNT.
Elliott and Keselowski were on the front row when a caution with 33 laps to go forced a decision on whether to pit for fresh tires. Both stayed on the track and Elliott faded following the restart until making his decisive charge at the very end.
Bracket busters
Ryan Blaney, the race favorite according to BetMGM Sportsbook, was knocked out on a wreck late in the first stage. Christopher Bell hit the wall, triggering the crash that ended the stage with Cindric in the lead.
Cindric was involved in the bigger crash early in Stage 2. Kyle Busch, Denny Hamlin and Bubba Wallace were among others involved in the crash.
Photo finish
Tyler Reddick beat Elliott to the finish line by .001 seconds to win Stage 2 in a battle between drivers looking for both their first stage win and overall win of the season.
Weather woes
Lightning and rain delayed qualifying Friday and the Xfinity race won by Nick Sanchez late Friday night. More lightning and rain threatened Saturday night's race. Fans were encouraged to leave the stands about 90 minutes before the race due to severe weather in the area but were allowed to return as pre-race were conducted as planned.
Up next
The Cup Series moves to Chicago for the Chicago Street Race on Sunday, July 6.
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