30-SOMETHINGS: Running backs PRIEST HOLMES (690 yards) of the Kansas City Chiefs and CURTIS MARTIN (683) of the New York Jets are the top two rushers in the NFL this season. Both are 31 years old.

Each this year will try to become the second player in NFL history to lead the league in rushing when starting the season at age 30 or higher. The only player to accomplish the feat is Pro Football Hall of Famer MARION MOTLEY, who rushed for 810 yards for the 1950 Cleveland Browns at 30 years old. If either Holmes or Martin leads the league, he would become the oldest rushing champion in NFL history.

Through their first seven games, Holmes is on pace to rush for 1,577 yards, and Martin for 1,561 yards. Following are the running backs with the most rushing yards in a season at the age 30 or higher at the start of the season:

MARVELOUS MARVIN: Indianapolis Colts wide receiver MARVIN HARRISON has 793 career receptions and needs seven catches to reach 800. Harrison seeks to reach the 800-catch level in his 130th career game this week when the Colts visit Kansas City. If Harrison accomplishes the feat Sunday, he will have reached 800 career receptions in the fewest number of games in history, besting JERRY RICE’s mark of 154 games by 24 games (one-and-a-half seasons).

The receivers with 800 career receptions in the fewest games:

Harrison and Colts quarterback PEYTON MANNING have connected on 655 receptions together, the second most by a QB-WR tandem in history. The duo needs nine catches this week to pass Buffalo’s JIM KELLY-ANDRE REED (663) for the most receptions by a quarterback-receiver combination in NFL history.

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PASSING FANCY: Through the first seven weeks of the season, the NFL’s completion percentage is 60.8, with passers completing 3,958 of 6,508 attempts. If that mark holds through the season, it would set a record for the highest completion percentage in a single season, besting the 59.7 percent of 2002. The NFL seasons with the highest completion percentage:

*Through first seven weeks

THE COMPLETE PACKAGE: Green Bay Packers quarterback BRETT FAVRE has completed 4,113 passes in his 14-year career. Favre ranks third in NFL career completions and needs 11 this Sunday at Washington to pass Pro Football Hall of Fame quarterback JOHN ELWAY (4,123) and move into second place all-time.

Quarterbacks with the most completions in history:

SACK ATTACK: A quarterback sack can change the complexion of a game for the both the offense and defense. This season, the top five teams with the highest sack differential -- defined as sacks by the defense minus sacks allowed by the offense -- have a combined 26-5 record (.839).

The top five teams in the category and their record:

MANY HAPPY RETURNS: Last Sunday, DEION SANDERS of the Baltimore Ravens had a 48-yard interception return for a touchdown, the 19th return TD of his career. Sanders’ 19 return touchdowns are the most by a player in NFL history. Nine of those touchdowns have come by interceptions, tying for the second most all-time in the category behind ROD WOODSON (12).

The leaders in career return touchdowns and career interception-return touchdowns:

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INTERSTATE 90: In the history of the NFL, there have been 17 touchdown runs of 90 yards or more. Last Sunday, Green Bay Packers running back AHMAN GREEN -- with a 90-yard TD run against Dallas -- joined BO JACKSON as the only players in history to accomplish the feat twice in a career. A breakdown of 90-yard NFL runs: