World number one Jason Day's impeccable form and lead atop the world golf rankings is playing on the mind of rival Jordan Spieth.
Day reigned supreme at The Players Championship last week, going wire-to-wire for a four-stroke victory in Ponte Vedra Beach, Florida.
It was Day's third title of the season and seventh in 17th starts as world number two Spieth missed the cut at TPC Sawgrass.
And as Spieth prepares for this week's AT&T Byron Nelson tournament, the two-time major champion said he is frustrated by the Australian's standing in the sport.
"There's some motivation there. He's playing his game. He believes his game is better than anybody else's, and he's on his game and so it is better than everybody else's," Spieth said.
"What he's doing right now, I think I can win the next two events and I'm still not going to surpass him in the world rankings.
"He's separated himself, and that bothers me and it motivates me."