Masters champion Jordan Spieth insists he is not running out of energy, despite having taken a break last week following six straight tournaments.
Spieth made the cut at every PGA Tour event he competed in between the WGC-Cadillac Championship and the RBC Heritage - winning the Valspar Championship and the Masters, while finishing second at the Texas Open and Houston Open - before missing the Zurich Classic of New Orleans last week.
The 21-year-old reckons his success has reinvigorated rather than fatigued him.
"If anything the last month has put more energy into this. Certainly being in contention for four straight weeks will take some out of you. But, I slept for a couple of days when I got home then back to work," Spieth said on Tuesday.
"At this point, I'm inching closer and closer to more goals that I have. Why not work as hard as I can to attain the goals if I'm already feel like I'm playing well and getting more and more comfortable?
"That's exciting to me and makes me want to work harder and harder and I don't really feel worn out."
Spieth is in California this week for the WGC-Cadillac Match Play Championship, and completed a practice round at TPC Harding Park on Tuesday.
Last year, Spieth reached the quarter-finals on debut before losing to Ernie Els.
The 2015 WGC-Cadillac Match Play will change the format slightly with a preliminary group stage, where each player plays three opponents for a spot in the last-16.
"The change in format, I don't think it does anything. It's more hype for you guys. It's more hype for the public. But all in all it's still win or go home," Spieth said.
"You certainly have a chance to get lucky if you lose one. But our mindset can't be like that … You don't really want to go to a play-off and you don't want to lose and rely on that guy losing the next two so you don't get the head-to-head."