Groups we're watching: Northern Trust Open, Rd. 2

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After a long day Thursday, they're at it again at Riviera.

Dustin Johnson, Nick Flanagan, Scott Mahlberg
Tee time: 11:50 a.m. ET
Tee: No. 1
Total TOUR wins: 0
Why you should watch: This may be jumping the gun slightly, as Johnson sits at 3-under through 15 holes. He will finish his first round Friday morning before starting his second. Johnson has been impressive so far this season, posting top-10 finishes in both the Sony Open in Hawaii and the AT&T Pebble Beach National Pro-Am.

Flanagan, after a three-win season last year on the Nationwide Tour, has struggled on the PGA TOUR, making one cut in his first four events of the year. Mahlberg is making his first TOUR appearance since 2001. Both Flanagan and Mahlberg will need a solid day today to climb back into contention.

Phil Mickelson, Hunter Mahan, Rory Sabbatini
Tee time: 3:12 p.m. ET
Tee: No. 10
Total TOUR wins: 37
Why you should watch: Mickelson and Mahan enter the second round tied at 3-under, three shots behind leader K.J. Choi. Both of their rounds could have been even better. Mickelson had two bogeys Thursday and Mahan had one.

Sabbatini, with two top-five finishes already this season, will try to rebound Friday after posting a one-over-par 72.

Chad Campbell, Joe Durant, Bart Bryant
Tee time: 3:22 p.m. ET
Tee: No. 1
Total TOUR wins: 11
Why you should watch: Campbell lit it up on Thursday, shooting a 67 despite a pair of bogeys. He sits two shots back of leader Choi starting today's action. Imagine where he may be at the end of today with a bogey-free round.

Durant starts the day at even par after posting his own two-bogey round of 71. Meanwhile, Bryant, is looking for his second top-20 finish of the season. He'll have to go some on Friday after posting a 74 on Thursday.