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Week 5 of the 2013 NFL season brought a few upsets and plenty of exciting games. Here's what we learned in the fifth week of the 2013 regular season:

Several undefeated teams in each conference have dominated the first few weeks of the 2013 NFL season. Here are five storylines we'll be watching this weekend:

Brandon Weeden passed for 197 yards and a touchdown in relief of starter Brian Hoyer, and the Browns overcame an early deficit to beat the Buffalo Bills, 37-24, on Thursday night in Cleveland.

Major League Baseball will feature four interesting matchups in its next round of postseason play. Here's what to watch this weekend:

Drew Brees threw for 413 yards and four touchdowns, and the Saints cruised past the Miami Dolphins, 38-17, in New Orleans on Monday night.

Most NFL teams have now completed the first quarter of their 2013 season. The Denver Broncos have looked unstoppable thus far, unlike most of the guys in the GIFs below, who were very stoppable.

We are beginning to see which teams will be chased — and who will be doing the chasing — throughout the 2013 NFL season. Here are five things we learned from Sunday's games:

Frank Gore ran for 153 yards and a score, and Colin Kaepernick threw two touchdown passes as the San Francisco 49ers dominated the Rams, 35-11 in St. Louis on Thursday night.

Peyton Manning passed for 374 yards and three touchdowns, and the Broncos easily beat the Oakland Raiders, 37-21, on Monday night in Denver.

The New England Patriots remained undefeated after the third week of the 2013 NFL season. That might be the only thing that's going according to script thus far.

Kansas City forced five turnovers, and the Chiefs beat the Eagles, 26-16, in Philadelphia on Thursday night.

Andy Dalton threw for 280 yards and a touchdown, and the Cincinnati Bengals beat the Pittsburgh Steelers, 20-10, in Ohio on Monday night.