IndyCar is getting close to the start of the 2016 season and the top drivers in the series are ready to hunt for a championship. But, some may have more to prove than others this year.

Target Chip Ganassi Racing’s Scott Dixon is the defending champion, Team Penske is celebrating 50 years of excellence, and we’re barreling toward the 100th running of the Indianapolis 500. While many are excited for the start of the 2016 IndyCar Series, a handful of drivers in the series might be more excited than others because they have something to prove this season.

Here’s a look at five drivers with something to prove in this year’s IndyCar season.