NFL Week 4 grades: Ravens get 'D' for blowing big lead vs. Bills, Raiders get an 'A' for picking up first win

Here are the Week 4 grades for every team that played on Sunday

If we've learned one thing about the Ravens this season, it's that you should never turn off any game they're playing in because there's a good chance they're going to blow a big lead. 

For the second time in three weeks, the Ravens looked to have a win wrapped up, and for the second time in three weeks, they let that win slip away. In Week 2, the Ravens blew a 21-point lead in the fourth quarter against the Dolphins. This time around, the Ravens blew a 17-point lead in a wild 23-20 loss to the Bills. 

It's hard to say which loss stings more, but it might be the latest one because of how it went down. With 4:16 left to play, the Ravens were facing a fourth-and-goal at Buffalo's 2-yard line, and at that point, they had a chance to attempt a field goal. However, John Harbaugh decided to go for the touchdown and the decision ended up backfiring in a big way: Lamar Jackson threw an interception.