Arizona's offense has limited mistakes and its special teams have come up with some big plays.
The big reason the Cardinals are off to their best start in 38 years? Their dominating defense.
Led by a powerful front line and fast, attacking linebackers, Arizona has the NFL's best scoring defense, allowing two touchdowns through the first three games.
The Cardinals held the Eagles without a touchdown for the first time since the 2009 season finale in a 27-6 win on Sunday and hammered quarterback Michael Vick, sacking him five times while forcing two fumbles.
Arizona has 12 sacks so far, two behind Chicago for the NFL lead, with seven different players getting at least one.
Behind their defense, the Cardinals are one of three NFL teams still undefeated.