Brock Purdy of the San Francisco 49ers retains his top position in the NFL quarterback power rankings following a 24-14 victory over the Denver Broncos in Week 4. Purdy's impressive stats include 218 passing yards, two touchdowns, and an unparalleled record of starting 4-0 with one or fewer sacks, fumbles, or interceptions. He leads the league in passer rating (126.2) and passing success rate (61.9%). His 0.53 expected points added (EPA) per dropback is the second-highest in the 21st century, trailing only Tom Brady's record in 2007.

Patrick Mahomes, quarterback for the Kansas City Chiefs, is close behind after helping his team to a 4-0 start. He has excelled outside the pocket, leading the league in completions and passing touchdowns in that scenario. Mahomes remains a top contender for the No. 1 spot.

Lamar Jackson of the Baltimore Ravens continues to shine with a stellar performance against the Tennessee Titans, throwing for 222 yards and two touchdowns. Dak Prescott of the Dallas Cowboys also impressed by throwing for a season-high 335 yards and a game-winning touchdown against the Houston Texans.

Other notable performances include Josh Allen from the Buffalo Bills, who has the most total touchdowns this season but struggled in a loss to the New England Patriots. Trevor Lawrence of the Jacksonville Jaguars and Jared Goff of the Detroit Lions also made significant contributions to their teams, showcasing their skills through four weeks of the season.

Bryce Young leads the league in passing yards, and Jordan Love is finding ways to succeed despite a struggling run game. Meanwhile, Michael Penix Jr. has revitalized the Atlanta Falcons offense, contributing to their recent scoring surge.

As the season progresses, the competition among these quarterbacks intensifies, setting the stage for an exciting Week 5.