All eyes will be on the star of 2015 Jordan Spieth and a fit-again Rory McIlroy at this week's US PGA Championship at Whistling Straits.
The battle for golfing supremacy between Jordan Spieth and Rory McIlroy will resume this week at Whistling Straits at the 97th edition of the US PGA Championship.
American Spieth has firmly established himself as a challenger to McIlroy's spot as the number one golfer in the world this year, winning two of the three majors held so far in 2015.
Spieth clinched both the Masters and the U.S. Open, as hopes were raised of him becoming the first man to win all four major tournaments in a calendar year.
Those dreams were dashed at The Open, where he could 'only' finish tied for fourth as Zach Johnson lifted the Claret Jug at St Andrews.
McIlroy, meanwhile, arrives at Whistling Straits aiming to defend the crown he won last year at Valhalla, looking to become the first man since Tiger Woods to claim back-to-back titles.
The Northern Irishman announced himself "100 per cent ready" for the Championship, after he missed The Open with ankle ligament damage suffered whilst playing football with friends back in July.
"It [the ankle] actually feels better when I go at it as hard as I want because my left foot sort of spins out of the way whenever I hit the driver anyway," McIlroy said.
"If my left foot was to stay completely flat, like roll on to the left side like a lot of guys do, then it would obviously create a few problems.
"Because mine sort of spins out of the way, it takes a lot of pressure off it."
Spieth can overhaul McIlroy as the world's top-ranked player with a victory, as long as the Northern Irishman does not finish second alone. A second place for Spieth would mean McIlroy would have to finish outside the top six.
The last time this Championship was held at Whistling Straits, in 2010, Martin Kaymer prevailed in a play-off against Bubba Watson following some last-hole drama.
After teeing off on the 18th with a one-shot lead, Dustin Johnson grounded his club in the sand off the right-hand side of the fairway and, not realising the area counted as a hazard, was given a two-shot penalty.
The world number eight will have no such problems in the same area this year, though, with that patch of the course now covered up by a hospitality area.
Tied for second at the US Open earlier this year, Johnson will be expected to challenge strongly again here.
But all eyes will likely be on Spieth and McIlroy, as the former looks to become the third man - after Ben Hogan and Woods - to win three majors in a calendar year and possibly complete his ascent to number one in the world.