Both Day and Scott share 2nd position at 2 under although they are some seven shots from the joint leaders Louis Oosthuizen and Kyle Stanley.
Both players recorded rounds of even par 72 to slip four places from their overnight position on Thursday evening, Scott recording four bogeys and four birdies while Day appeared to be heading in the right direction before a three putt bogey at the 14th followed by another bogey at the 15th after pulling his approach from the middle of the fairway into the greenside bunker and failed to get up and down.
Day would birdie the 16th after a great drive and then parred the 17th and 18th, the 18th in particular a good save after finding the right hand rough.
Scott was disappointed at letting opportunities slip at the par fives. "I let it go on a couple of par-5s that had 5-iron in and made bogey, and that's costly around here. So I think the rest of it was really good other than that.
"But you know, I'm going to have to sharpen that up for the weekend. The rhythm of the swing wasn't quite there today like it was yesterday, so if I can just go out and find that for tomorrow, I like where I'm at."
Day acknowledged the gap between he and the leaders but was still optimistic about his chances.
"Yeah, you don't really need too much around here," he said. "I'm seven behind the leader, I mean, that's a pretty big margin, but you get off to a good round tomorrow and you just never know what happens on Sunday, especially at a place like this. It's difficult to try and close around here, but I need a good one tomorrow."
Aaron Baddeley moved to the edge of contention when he birdied two of his first seven holes to move to 4 under for the tournament but dropped shots through the middle of his round. He would birdie the 16th after a magnificent approach at the par five set up a 10 foot birdie chance which he missed. He is in 34th position at 1 under.
Rod Pampling made the cut on the number but Cameron Smith, Marc Leishman and Greg Chalmers will have the weekend off.
Of the leaders, Louis Oosthuizen is chasing his first event in the US, his only PGA Tour title coming at the Open at St Andrews in 2010 while Stanley has just the one PGA Tour win that coming when successful at the Phoenix Open in 2012.
Pre-tournament favourites, Dustin Johnson, Rory McIlroy and Sergio Garcia are at even par and nine shots from the lead while Jordan Spieth continued his ordinary record at the TPC Sawgrass by missing the cut for the third consecutive year.
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