For the second time in four years, the Championship 4 in the Cup Series is an even split between the two winningest playoff teams in NASCAR history.

Things are going to be changing for Ross Chastain next season. Trackhouse Racing is making a move at crew chief. Phil Surgen is on his way out after spending the last four years with Chastain.

With a Championship 4 spot on the line Sunday, William Byron put the bumper to Ryan Blaney to win at Martinsville Speedway in the third-round finale of the NASCAR Cup Series playoffs. Byron made his winning move with 43 laps remaining,

William Byron won the NASCAR Cup Series race on Oct. 26 at Martinsville. Here are our winners and losers from the race.

The NASCAR on NBC Throwback marathon will air in three windows on the NBC Sports NOW channel, a free 24/7 streaming channel from NBC Sports offering daily sports talk shows, live sports and highlights on Peacock, The Roku Channel, Xumo, Pluto TV and more.

William Byron put on a dominating performance when he needed it most. The Hendrick Motorsports driver beat Ryan Blaney in an 11-lap dash and won the Xfinity 500 at Martinsville Speedway, putting him in the field with teammate Kyle Larson for next weekend's championship race after Sunday's NASCAR Cup Series Round of 8 finale in Martinsville,

Byron bested Blaney for the Martinsville win, ensuring two Hendrick drivers will face off against two JGR drivers in the finale