US PGA: Adam Scott aiming to clinch No.1 crown at Valhalla
Rory McIlroy's fifth spell as world number one could last a single week depending on results in the US PGA Championship at Valhalla.
McIlroy's victories in the Open Championship and WGC-Bridgestone Invitational have lifted the 25-year-old above Adam Scott in the rankings, but only by 0.17 points.
Scott would reclaim top spot with a win on Sunday, regardless of where McIlroy finishes, and even a top-20 finish would be good enough for the Australian if McIlroy missed the cut and Sergio Garcia, Henrik Stenson and Justin Rose failed to win.
Garcia, Stenson and Rose can all become world number one for the first time in their careers with a win, but they would also be reliant on McIlroy and Scott's results to varying degrees.
"I think the right guy is at number one at the moment," former Masters champion Scott admitted. "He's played the best over the last couple months.
"The guy who is winning the most tournaments probably should be the number one player and he's won three really big tournaments this summer and I've won one event.
"My consistent play is good, but you want the rankings to work and favour guys that win big events like that.
"I hope that I can go ahead and win this week and maybe go back to number one, but there's no doubt Rory has played the best golf out of anyone over the last few months."