The Kansas City Chiefs and San Francisco 49ers remain unbeaten after the fourth week of the NFL season, as the number of teams with perfect records fell from five to three following Sunday’s action.
Five teams entered week four without a defeat. By the end of Sunday’s games, two of those teams had lost their unbeaten status, while the Chiefs and 49ers continued their perfect starts.
The result leaves three NFL teams yet to lose after four weeks of the season. The supplied information identifies Kansas City and San Francisco among them but does not name the third unbeaten team.
The change in the standings highlights the impact of week four, with the group of undefeated teams reduced as the regular season progressed. The Chiefs and 49ers will now look to maintain their records in the next round of fixtures.
