Three races into the 2015 season and a few of the championship favorites are already Chase bound.  The three drivers that have already clinched the postseason by virtue of a win include reigning champion Kevin Harvick, six-time champion Jimmie Johnson and 2014 Chase finalist Joey Logano.

This weekend's CampingWorld.com 500 could give a fourth driver the opportunity to clinch a Chase berth.  But, with the way those three winners have run up front on a weekly basis so far, there's a strong possibility that the race will produce the season's first multi-race winner.

Here are three drivers to watch during the race:

Green Flag - Kevin Harvick

Harvick has finished first or second in each of the last six races dating back to last November at Texas.  He has also won each of the last three races at Phoenix and led 488 of 612 laps run at the track in 2014.  He's a clear favorite this weekend.

Caution Flag - Jimmie Johnson

Johnson has four wins and 14 top-fives in 23 starts at Phoenix, so he should be good to go at this track.  In the first three races of 2015, he's led no less than 39 laps, so he should be good to go this season, in general.  However, he's seeing the yellow flag in this preview because the car had an issue last week.  The No. 48 team struggled to fix it, ultimately needing to pull Johnson into the garage before sending him back out 31 laps down.  It's an uncommon issue for Chad Knaus and his crew to not be able to fix the car on the fly.  It's probably just a minor setback, but is still temporarily disconcerting.

Red Flag - Kurt Busch

Busch completed the requirements for reinstatement and will return to the NASCAR Sprint Cup Series this weekend after a three-race suspension.  However, it remains a question as to how competitive he'll be.  Busch used a March win last year to qualify for the Chase, but struggled to run up front for much of the season following that.  He got eliminated with the also-rans in the first round of the Chase, and registered just six top-fives after having 11 with the single-car outfit of Furniture Row Racing in 2013.  Expectations for Busch's performance should be moderate at this point.