New year, same results for LSU football in Week 1.

For the third consecutive season under Brian Kelly, the Tigers were unable to start the season off with a victory as they fell to No. 23 USC 27-20 Sunday night in Las Vegas at the Modelo Vegas Kickoff Classic.

After all, this is the risk of scheduling a top-25 opponent to kick off the season.

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LSU was driving on offense late in the fourth quarter, and got into the red zone by the time of the two-minute timeout. But first-year starting quarterback Garrett Nussmeier and the Tigers weren't able to score a go-ahead touchdown. Instead, they settled for three points and the field goal to tie the game at 20-20, giving the Trojans the ball back with 1:47 remaining.

USC marched down the field on a two-minute drill to pull out the victory. The Trojans' game-winning touchdown run from Woody Marks was set up by a 15-yard targeting penalty from LSU safety Jardin Gilbert, who was ejected from the game.

While he was unable to lead LSU to a game-winning drive, Nussmeier impressed in his second career start as he completed 29 of 38 passes for 304 yards and two touchdowns. The Tigers will now return home to Baton Rouge for their home opener against Nicholls on Saturday, Sept. 7 at 6 p.m. CT.

With that, here's a look at how far LSU could drop in the US LBM Coaches Poll and AP Top 25 after its loss to USC:

LSU football rankings: Where will Tigers fall in top 25?

While it's a "good" loss on paper for LSU — as USC is a ranked opponent and will likely move up in the polls itself — the Tigers will certainly fall back a few spots come the release of the Week 2 polls on Tuesday.

The Tigers did not get any help from the teams closest to them in the polls — those ranked No. 10 through No. 20 — as nine of those 10 teams won their Week 1 games. The only teams that lost were No. 14 Clemson and No. 20 Texas A&M.

REQUIRED READING: Grading LSU football after heartbreaking loss to USC in Las Vegas to open season

Here's a breakdown of how the rest of the top 15 did in Week 1, using the preseason US LBM Coaches Poll rankings:

Note: No. 10 FSU still has to play Boston College Monday night

• No. 1 Georgia: 34-3 win over No. 14 Clemson

• No. 2 Ohio State: 52-6 win over Akron

• No. 3 Oregon: 24-14 win over Idaho

• No. 4 Texas: 52-0 win over Colorado State

• No. 5 Alabama: 63-0 win over Western Kentucky

• No. 6 Ole Miss: 76-0 win over Furman

• No. 7 Notre Dame: 23-13 win over No. 20 Texas A&M

• No. 8 Michigan: 30-10 win over Fresno State

• No. 9 Penn State: 34-12 win over West Virginia

• No. 10 Florida State: Monday at 6:30 p.m. CT vs. Boston College

• No. 11 Missouri: 51-0 win vs. Murray State

• No. 12 LSU: 27-20 loss to No. 23 USC

• No. 13 Utah: 49-0 win vs. Southern Utah

• No. 14 Clemson: 34-3 loss to No. 1 Georgia

• No. 15 Tennessee: 69-3 win over Chattanooga

USC almost certainly will leap ahead of the Tigers in the latest polls, but losses by No. 14 Clemson (to No. 1 Georgia) and No. 20 Texas A&M (to No. 7 Notre Dame) will help mitigate how far LSU falls in the latest polls.

The likelihood of LSU dropping to the high teens is higher than it dropping entirely out of the top 25.

This article originally appeared on Lafayette Daily Advertiser: LSU football top 25 rankings: Where will Tigers fall after Week 1 loss?