In a game with wild swings and pass-happy quarterbacks, Patrick Mahomes threw for 326 yards and six touchdowns Sunday to lead the Kansas City Chiefs past the host Pittsburgh Steelers 42-37.

The Chiefs (2-0) blew a three-touchdown lead, went back up by 14 points and held on.

Kansas City's Travis Kelce had 109 receiving yards and two touchdowns. Mahomes has set an NFL record with 10 touchdown passes through the first two games of a season, and he finished with more touchdowns than incompletions (five).

Ben Roethlisberger was 39-of-60 passing for 452 yards and three touchdowns, and he rushed for another, for Pittsburgh (0-1-1). Jesse James had 138 receiving yards with a touchdown, and JuJu Smith-Schuster 121 yards and a touchdown.

It was the Chiefs' turn to score in the first quarter.

Mahomes' first scoring pass came 1:55 into the game, 15 yards to Chris Conley. Kelce was up next, a 19-yard touchdown reception over the middle and a 14-0 lead with 9:08 left in the first.

Pittsburgh's Chris Boswell missed a 49-yard field goal, and Kansas City said thank you with a 61-yard, six-play drive ending with Mahomes' 5-yard scoring pass to Kareem Hunt to make it 21-0.

It was Pittsburgh's turn in the second quarter.

Roethlisberger targeted James for a 26-yard touchdown in the first minute of the quarter, and he had a 2-yard scoring pass to Smith-Schuster. Boswell missed the extra point, leaving it 21-13.

After Roethlisberger struck again, a 14-yard touchdown to rookie James Washington, he hit James Conner for a two-point conversion for a 21-21 tie with 18 seconds left in the half.

The teams began trading touchdowns in the third -- Mahomes' 25-yard pass to Kelce, Conner's 1-yard run, and Mahomes' 3-yard pass to Demarcus Robinson gave the Chiefs a 35-28 edge.

Kansas City broke the cycle when Mahomes threw his sixth touchdown pass, 29 yards to Tyreek Hill at 13:42 of the fourth.

Hunt got tackled in his own end zone for a safety to close the gap to 42-30, after Steelers punter Jordan Berry pinned the Chiefs at their 1-yard line with a 59-yard boot out of bounds.

After Conley turned the ball over on a fumble, Roethlisberger capped a 66-yard drive with a 3-yard keeper to make it 42-37, but the Steelers never got the ball back.

--Field Level Media