Rory McIlroy   returns to action at the Deutsche Bank Championship on Friday. Photograph:  Kevin C Cox/Getty Images

Where once it looked as if Rory McIlroy’s ownership of the world number one spot would be long-term, with the potential to rival the longevity of T(...)

Jason Day of Australia plays a shot from the rough on the 12th hole during the final round of The Barclays at Plainfield Country Club. Photograph: Hunter Martin/Getty Images

Red-hot PGA Championship winner Jason Day of Australia romped to victory at The Barclays on Sunday, winning the opening event of the lucrative FedExCu(...)

 Jordan Spieth  walks  to the  ninth tee   during the second round of The Barclays at Plainfield Country Club  in Edison, New Jersey. Photograph: Ross Kinnaird/Getty Images

Jordan Spieth has missed the cut at The Barclays and is set to lose his status as world number one to Rory McIlroy. Spieth, who shot his worst score ((...)

Bubba Watson of the United States watches his birdie putt on the 18th hole during the first round of The Barclays at Plainfield Country Club. Photograph: Hunter Martin/Getty Images

Bubba Watson charged into a tie for the first-round lead at The Barclays on Thursday while newly crowned world number one Jordan Spieth struggled to h(...)

Jason Day with Jordan Spieth: “It’s going to be tough to unseat Jordan because he’s played such amazing golf this year.” Photograph: Jamie Squire/Getty Images

Newly-crowned PGA champion Jason Day sees the FedExCup play-offs as the opportunity for a challenge to world number one Jordan Spieth in the voting fo(...)

Tiger Woods in action during the pro-am at the Wyndham Championship at Sedgefield Country Club. “He is at the bottom of the mountain at the moment, but you have to start somewhere,” said Jason Day. Photograph: Rob Brown/AP

Tiger Woods heads into this week’s crunch Wyndham Championship with a warning from Jason Day that the majority of players no longer fear him. Woods’ c(...)

Paul Dunne: produced an amazing display at the British Open where he was co-leader with a round to go.  Photograph: Paul Childs/Reuters

Nigel Edwards won’t feel pressure when he sits down this weekend to draw up the Walker Cup team to face the USA. When the 10 names are announced on Mo(...)

Jason Day  with his caddie Colin Swatton on the 18th green after winning the 2015 PGA Championship  at Whistling Straits, Sheboygan, Wisconsin, on Sunday. Photograph: Jamie Squire/Getty Images

No standing still. Ever. As golf’s newest Major champion has discovered, the desire for more is insatiable. And, although Jason Day’s journey to a (...)

An emotional Jason Day  with his caddie Colin Swatton on the 18th green after winning the 2015 US PGA Championship  at Whistling Straits  in Sheboygan, Wisconsin. Photograph: Richard Heathcote/Getty Images

An emotional Jason Day reflected on the deep sacrifices made by his mother after winning the US PGA Championship at Whistling Straits on Sunday to cla(...)

Jordan Spieth of the United States is the second youngest player to ever top the world rankings. Photograph: Jamie Squire/Getty Images

Jordan Spieth has replaced Rory McIlroy as world number one after finishing second to Jason Day in the US PGA Championship. McIlroy finished 17th at (...)