Seibert made all seven field-goal attempts in Sunday's 21-18 win over the Giants.
Seibert just joined the Commanders on Tuesday after the team decided to cut Cade York. He made the decision pay off in Week 2, making himself responsible for every point put on the board in their divisional win. The Oklahoma product hit six field goals from 33 yards out or less, including the game-winner from 30 yards out as time was expiring to seal the victory. His long for the day was from 45 yards. Next up for Seibert and Washington are the Bengals on MNF in Week 3.