Aussie world No.1 Jason Day charged up the leaderboard on day two of the AT&T Pebble Beach National Pro-Am before play was halted due to gof.

Day is one back with six holes remaining at Spyglass Hill before the players went off for the second straight day. His red-hot round includes seven birdies – four of those coming in his last four holes before play ended.

Check out his scorecard:

The man he is chasing is Jordan Spieth. Based on his preparation earlier this week, Spieth expected to play well: “I would say that everything is lining up real well in my game,” he said Wednesday after a practice round at Pebble Beach Golf Links.

They are lining up even better after 36 holes. The No.6 player in the world, Spieth is the clubhouse leader at 10-under 133 after a 7-under-par 65 at Spyglass Hill on the soggy and foggy Monterey Peninsula.

Seeking his first US PGA Tour win since May at Colonial, Spieth had started slowly in his previous three events this year, resulting in two thirds and a tie for ninth place last week in Phoenix. No such problem thus far, with Pebble Beach on the horizon Saturday for the former world No.1.

Also at 10-under was Derek Fathauer, who was 8-under on his round with one hole left to play at Pebble Beach.

None of the elements seem to be bothering Spieth, who straightened out his short game on Monday and then spent time in a simulator Tuesday to check on his swing and solidify his putting stroke. So far, one of the game’s best putters is putting well. The hole is looking bigger. But scoring requires less sweat when you hit 29 of 36 greens in regulation.

“I’ve been pretty dialled in with my ball striking. It really hasn’t been much of my putting,” said Spieth, 23, who was T-4 here in 2014 after holding a share of the halfway lead. “I’m putting a little better than I did in my last three tournaments and that’s why we’re towards the top of the board.”

To stay on top, his plan was simple: “It’s out there, you can throw darts. So you’ve got to keep the pedal to the metal.”

He has the mettle for that.