Last week at Sonoma, Dixon held the lead until he received a drive-through penalty with 15 laps to go for hitting a tire in the left hand of Power's tire holder.
During a restart on the 53rd lap Sunday, Power swerved right in a crowd in front of Dixon while trying to pass Sebastien Bourdais. Power clipped the barrier, and Dixon ultimately lost control and smacked into the wall, ending his day.
Afterward, a distraught Power said, "I feel terrible. I'm just so sorry."
Power made it to the pit but was given a penalty for interference and finished 18th, one spot ahead of Dixon.
• Chase Elliott wrecked Ty Dillon on the last lap Sunday to win the NASCAR Truck Series race in Bowmanville, Ontario.
At 17 years, 9 months, 4 days, Elliott became the youngest winner in series history.
Rooney will miss England qualifiers
SOCCER • Manchester United manager David Moyes says Wayne Rooney has "no chance" of playing for England in its two upcoming World Cup qualifiers after cutting the middle of his forehead in training Saturday.
From wire reports