Despite contending heavily in his last two starts, Australian golfer Jason Day says his peak is yet to come in 2014.

In his last two starts, Jason Day has been in the thick of final-round action, but the world No.7 knows his best this season is still in front of him.

Day made the turn in the last round of the US PGA Tour’s opening playoff event last week with the lead but was overrun by a rampant Hunter Mahan, forcing him to settle for a tie for second.

In his previous start, the PGA Championship, Day was amongst a host of challengers before fading to tie for 15th.

Had the Queenslander been at his peak the results may have been more frustrating, but after a year of limited practice due to injury and illness, Day expects to hit his straps at this week’s Deutsche Bank Championship just south of Boston.

His last two results have been part of an upsurge as the hard practice work he has put in over the last four weeks comes to fruition.

With a thumb injury plaguing his season, Day wasn’t given the all-clear to practise without limitations until the week of the World Golf Championships Bridgestone Invitational in late July.

Ironically he had to withdraw from the tournament halfway through with a bout of vertigo but once healthy has gone back to a heavy practice regime to make up for lost time.

The Day camp estimated the 26-year-old was around 9000 practice balls short of what he may have been without injury but have put in the hard yards since being cleared, even practising post-rounds last week when he was leading the tournament.

“We are ahead of schedule which I’m very, very happy with and pleased with how things are coming along but I do feel like my best is still to come,” Day said as he prepares for week two of the four-week playoff run.

“Last week I didn’t lose it, which was a good thing. I played well, tried my best and just wasn’t good enough as Hunter won it.

“It puts the fire in my belly and I’m looking forward to this week and I feel like it’s a good set-up for me.”

Day is seventh overall and the highest-placed Australian on the points list after last week’s result and he will travel next week to Cherry Hills in Denver and then the season-ending Tour Championship in Atlanta.

The 30 players in Atlanta all have a mathematical chance of winning the FedEx Cup and the $US10 million ($A10.82 million) bonus but those in the top five have their destiny in their own hands knowing a win in the final event ensures they win it all.

“I feel like I’m peaking at the right time, I’m trending in the right direction and I have now really given myself a shot at winning the FedEx Cup,” Day said.

“That’s the ultimate goal now, and you can’t do that without winning.”

The playoffs drop from 100 eligible players this week to 70 next week, with Adam Scott (16th), Stuart Appleby (19th), John Senden (28th), Marc Leishman (36th) and Steven Bowditch (44th) all assured of moving to week three despite results this week.

Matt Jones (54th) would be extremely unlucky to fall out of the top 70 but Geoff Ogilvy, as the last-ranked player at 100th, needs a huge result to move on.