BATON ROUGE — It didn't take long for LSU football to seize control of its game with South Alabama inside Tiger Stadium on Saturday night.

Freshman running back Caden Durham scored twice in his first three touches of the game. Junior quarterback Garrett Nussmeier threw for more than 400 yards as the No. 13 Tigers blew out the Jaguars 42-10.

After dropping its season opener in Las Vegas to USC, LSU has now won four straight games and heads into the off week with some good feels.

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How the first few weeks of this season has played out for the Tigers, especially with injuries to some star and key players like junior linebacker Harold Perkins and senior defensive tackle Jacobian Guillory, they needed some confidence and vibes before entering the tougher portion of their schedule in October.

Offense: A-

LSU found something with freshman running back Caden Durham and kept feeding him. It was a very good game plan as Durham piled up more than 200 total yards as the offense scored on its first four drives.

Defense: A-

Many experts believed South Alabama was going to come into Baton Rouge and move the ball at will. LSU defensive coordinator Blake Baker and his guys had different ideas. LSU bottled up the Jags' dynamic duo of Gio Lopez and Fluff Bothwell.

Special teams: B+

Zavion Thomas was one step away from breaking a punt return for a touchdown. Punter Blake Ochsendorf had a punt downed inside the 5-yard line.

Coaching: B+

Considering what Baker and the defensive staff dealt with this week with not having Harold Perkins, the coaching staff did a whale of a job with adjustments.

Overall: B+

LSU played one of its more complete games of the season to this point but it outclassed its opponent at every position on the field. The Tigers took care of business.

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Cory Diaz covers the LSU Tigers for The Daily Advertiser as part of the USA TODAY Network. Follow his Tigers coverage on Twitter: @ByCoryDiaz. Got questions regarding LSU athletics? Send them to Cory Diaz at bdiaz@gannett.com.

This article originally appeared on Lafayette Daily Advertiser: Grading LSU football's win over South Alabama