The Vikings got on the winning track last week by defeating the Detroit Lions 26-16. They'll look to stay there this Sunday in a second consecutive home game against another 1-1 team – the San Diego Chargers. The Chargers won their season-opener, also defeating the Detroit Lions, but dropped their Week 2 to the Bengals in Cincinnati last week.

Here are five of the biggest storylines we'll be chasing in the build-up to Week 3...

1. Rivers poses strong challenge for Vikings defenseA lot changes in the NFL, but one thing that hasn't changed in a long time is the identity of the starting QB for the Chargers. Philip Rivers has been at that post since 2006, starting 16 games every season since then. He has a 64.9% career completion rate, a 256-125 career TD-INT ratio and a career passer rating of 95.9. Rivers handles the entire offense every snap, from setting protections to getting the offense in the right play call based on the defensive look. The Vikings coaching staff has a lot of respect for Rivers, with head coach Mike Zimmer calling him a "special player" during this week's Vikings GamePlan taping and with offensive coordinator Norv Turner having been Rivers' head coach from 2007-12.

2. Will history be on repeat?It was the Vikings-Chargers meeting two times ago when Adrian Peterson set a new NFL single-game rushing record with 296 yards. The head coach of the Chargers that day? It was Norv Turner. About the only constants between that game in '07 and this year's game are Peterson and Turner, and now Turner is on the Vikings side. But that won't stop anyone from taking a stroll down memory lane to relive the greatest individual single-game rushing performance the League has ever seen. 

3. Peterson still searching for the end zoneAdrian Peterson ran wild against the Lions last week, rushing for 134 yards on 29 carries and totaling 192 yards of offense on the day. But he didn't find the end zone and hasn't done so since the 2013 season. He will look to change that against the Chargers on Sunday. Peterson has 91 career regular season TDs and trails only Randy Moss (93) and Cris Carter (110) for the most in Vikings history.

4. Run defense looks to double down
Being better against the run was a top priority for the Vikings in 2015. After a rough start to the season in San Francisco where the defense surrendered 230 rushing yards, the Vikings run defense rebounded with a vengeance in Week 2 by allowing only 38 yards, the fewest for any Mike Zimmer defense since the Bengals held Chicago to 35 rushing yards in 2009. The 38 rushing yards allowed ranks as the sixth lowest total ever allowed by a Zimmer defense since he became a coordinator in 2000. The run defense will be challenged this week by a quality tandem in the form of first-round pick Melvin Gordon and veteran Danny Woodhead.

5. Waynes and Gordon set for a first round reunionChildhood friends will reunite on Sunday and will be on opposite sidelines for just the second time in their lives. Vikings CB Trae Waynes, selected 11th overall this year, and Chargers RB Melvin Gordon, selected 15th overall this year, remain close friends and were high school teammates before going their separate ways in college. Waynes attended Michigan State and Gordon played for his home state Wisconsin Badgers. Waynes won the lone college battle between the two when Michigan State defeated Wisconsin 16-13 in overtime on October 27, 2012.