Kenseth takes a bow amid the carnage (LAT photos)

Matt Kenseth escaped a massive pile-up in Turn 4 on lap 189 of Sunday's Good Sam Roadside Assistance 500 at Talladega Superspeedway to win the fourth race in the Chase for the NASCAR Sprint Cup.

Jeff Gordon likewise dodged the 25-car crash, triggered by contact between Tony Stewart's Chevrolet and Michael Waltrip's Toyota, and ran second, followed by Kyle Busch, David Ragan and Regan Smith.

Brad Keselowski finished seventh and extended his championship lead to 14 points over Jimmie Johnson, whose Chevrolet was heavily damaged in the wreck and limped home in 17th.

The handling of Kenseth's car was on the loose side, forcing the driver of the No. 17 Ford to run the middle lane. That turned out to be a blessing, as Stewart and Waltrip collided near the bottom of the track.

"The track kept getting looser for me as the day went on and we never could get it tightened up," said Kenseth, who posted his second victory of the season, his first at Talladega and the 23rd of his career. "On the last lap that's why I chose the middle groove. I knew I couldn't be on the bottom or I'd get spun out, so I had to run the middle or the top to try to make a move. . . .

"I didn't know what was going happen and I'm still not sure what happened. Somehow I think Tony got turned and caused a big wreck."

Jamie McMurray, who had led 39 laps, spun in the tri-oval on lap 183, as he got a push from Kevin Harvick. McMurray brought out the fourth caution, but, miraculously, no other cars were collected in the incident.

Clint Bowyer led the field to the restart on lap 188, but Stewart quickly took the point. Trying to block Waltrip in the final corner, Stewart turned across the nose of the No. 55 Toyota and triggered the wreck.

Stewart took full responsibility for the melee that scrambled the order of finish.

"I just screwed up," Stewart said. "I turned down across – I think it was Michael – and crashed the whole field. It was my fault, blocking to try to stay where I was at. I take 100 percent of the blame.

"I was trying to win the race, trying to stay ahead of Matt there, and Michael got a great run on the bottom, had a big head of steam. When I turned down, I turned down across the right-front of his car. It was just a mistake on my part, but it cost a lot of people a bad day because of it."

Gordon wasn't surprised at the last-lap chaos. He was surprised it didn't happen earlier.

"I don't know how we made it to the white flag," said Gordon. "Coming through that tri-oval, being hit from behind, hitting the guy in front of me, you're sandwiched in-between basically cars. There are cars doing the same thing on that side of you, cars on that side of them doing the same thing.

"I really don't know how we made it to the white flag. It was just insane. But you're doing all you can to try to move your lane and hope that you make it back around. In today's case, we did."

The first round of green-flag pit stops proved the undoing – albeit temporarily – of Dale Earnhardt Jr., Kyle Busch and Trevor Bayne, all of whom were flagged for speeding on pit road. After serving pass-through penalties, all three drivers were lapped by the pack.

Just past the halfway point, Kenseth surged past Kurt Busch into the lead, marking a full recovery from a lap 42 spin off the bumper of teammate Biffle and subsequent spectacular save.

Bayne got his lap back as the "lucky dog" on lap 99, when Kurt Busch lost fuel pressure off Turn 2 and spun off the bumper of McMurray's Chevrolet, slamming the wall and causing the second caution of the afternoon.

Driving James Finch's Phoenix Racing Chevrolet for the final time before debuting for Furniture Row Racing next weekend at Charlotte, Busch --helmet off and out of radio contact with his team and NASCAR – drove away from the accident scene before NASCAR had cleared him and was parked for his effrontery.

It wasn't until 40 laps later that Earnhardt and Kyle Busch regained their lost laps. Earnhardt paced the field as the last car on the lead lap when NASCAR called a caution for debris on lap 39. Busch also rejoined the lead lap as the highest-scored lapped car and restarted third on lap 144 after the vast majority of drivers returned to pit road to top off their fuel tanks on lap 142.

Caught up in the wreck on the last lap, Earnhardt came home 20th.

Results - 189 laps:

Pos  Driver                Team/Car                         Time/Gap
 1.  Matt Kenseth          Roush Fenway Ford            2h56m12.000s
 2.  Jeff Gordon           Hendrick Chevrolet               + 1.819s
 3.  Kyle Busch            Gibbs Toyota                     + 2.384s
 4.  David Ragan           Front Row Ford                   + 6.927s
 5.  Regan Smith           Furniture Row Chevrolet          + 8.137s
 6.  Greg Biffle           Roush Fenway Ford                + 8.609s
 7.  Brad Keselowski       Penske Dodge                    + 12.474s
 8.  Travis Kvapil         BK Toyota                       + 13.391s
 9.  Ryan Newman           Stewart-Haas Chevrolet          + 14.996s
10.  Jeff Burton           Childress Chevrolet             + 23.828s
11.  Kevin Harvick         Childress Chevrolet             + 24.231s
12.  Kasey Kahne           Hendrick Chevrolet              + 25.298s
13.  Martin Truex Jr       Waltrip Toyota                  + 25.785s
14.  Denny Hamlin          Gibbs Toyota                    + 25.928s
15.  David Gilliland       Front Row Ford                  + 30.013s
16.  Terry Labonte         FAS Lane Ford                   + 35.183s
17.  Jimmie Johnson        Hendrick Chevrolet              + 39.677s
18.  Bobby Labonte         JTG Daugherty Toyota            + 42.410s
19.  Aric Almirola         Petty Ford                    + 1m02.103s
20.  Dale Earnhardt Jr     Hendrick Chevrolet            + 1m09.307s
21.  Trevor Bayne          Wood Brothers Ford                + 1 lap
22.  Tony Stewart          Stewart-Haas Chevrolet           + 1 lap*
23.  Clint Bowyer          Waltrip Toyota                   + 1 lap*
24.  Sam Hornish Jr        Penske Dodge                     + 1 lap*
25.  Michael Waltrip       Waltrip Toyota                   + 1 lap*
26.  Casey Mears           Germain Ford                     + 1 lap*
27.  Marcos Ambrose        Petty Ford                       + 1 lap*
28.  Paul Menard           Childress Chevrolet              + 1 lap*
29.  Dave Blaney           Baldwin Chevrolet                + 1 lap*
30.  Landon Cassill        BK Toyota                         + 1 lap
31.  Michael McDowell      Parsons Ford                      + 1 lap
32.  Joey Logano           Gibbs Toyota                     + 2 laps
33.  David Stremme         Inception Toyota                 + 2 laps
34.  Jamie McMurray        Earnhardt Ganassi Chevrolet     + 5 laps*
35.  Robert Richardson Jr  R3 Chevrolet                    + 9 laps*
36.  Carl Edwards          Roush Fenway Ford               + 10 laps

Retirements:

     David Reutimann       Baldwin Chevrolet                163 laps
     Juan Pablo Montoya    Earnhardt Ganassi Chevrolet      156 laps
     Kurt Busch            Phoenix Chevrolet                 98 laps
     Cole Whitt            Circle Sport Chevrolet            16 laps
     Joe Nemechek          NEMCO Toyota                      12 laps
     Timmy Hill            NEMCO Toyota                       8 laps
     Josh Wise             Front Row Ford                     5 laps

* Not running at finish