"You've got to love NFL scheduling," Arizona wide receiver Larry Fitzgerald said.
Williams provided what quarterback Drew Stanton called the "shot in the arm" the Cardinals needed on Sunday in Arizona's 17-14 victory over the Kansas City Chiefs.
CONTROVERSIAL CALLS: The Chiefs were on the wrong end of a couple of controversial calls in the second half,
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TURNOVERS: Arizona won the turnover battle 2-0, with an interception and fumble recovery.
"It was scary at first," Charles said. "I thought I tore it up.
Arians gave Williams a game ball. Williams said he would give it to his parents.
The Cardinals (10-3), who had lost two in a row, needed the win to stay a game ahead of Seattle in the NFC West. Now they have a short week to prepare for a Thursday night contest at St. Louis.
On Friday, Williams practiced with the scout team, pretending to be Jamaal Charles. Afterward, coach Bruce Arians told him he was being elevated to the regular roster.
Kansas City has a minus-six turnover ratio.
Williams' big game came the same day that Arians said running back Andre Ellington's season is over. Ellington is to have surgery to repair a hernia. He never had been at full strength this season.
"This is the story of our season," said linebacker Alex Okafor, whose interception stopped a Kansas City drive and led to the Cardinals' lone touchdown. "Playing hard in the first half, but cranking it up in the second half, especially at home."
The Chiefs (7-6) dropped their third straight and trail three teams in the AFC wild card chase.
In the second half, Charles rushed for 17 yards in seven carries.
It's also the most since the Chicago Cardinals won 11 of 13 home games in 1925.
The Cardinals are 13-2 at home since Arians became coach.
The Cardinals have a plus-10 turnover ratio. They have 17 interceptions,
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In the fourth quarter, Arians challenged a call that tight end Travis Kelce was down by contact after a 19-yard pass reception to the Arizona 22. After the review,
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GLENDALE, Ariz. (AP)