Matt Kenseth is usually so calm and collected, but he lost his cool and attacked Brad Keselowski at Charlotte Motor Speedway.

If Kenseth is fighting, then tempers are certainly running quite high.

They reached a boiling point in the aftermath of Saturday night's race as Keselowski, Kenseth, Dale Earnhardt Jr. and Jimmie Johnson all saw their championship hopes fade to near-desperate status.

The pressure is on — every week — in NASCAR's new championship format, and the frayed nerves unraveled on the track, on pit road and in the garage.