IT’S NOT often an athlete can sit on the couch and become a world No.1, but Jason Day is enjoying his ‘effortless’ return to the top of golf.

“It was a tough week for me but I ground it out around the house,” Day joked to AAP.

The Queenslander will regain golf’s top spot despite remaining at home in Ohio as he awaits the birth of his second child.

Day, at 27, became Australia’s youngest ever world No.1 golfer after winning the BMW Championship last month, but young gun Jordan Spieth took it off him a week later when the Texan won the Tour Championship and FedEx Cup points race.

Neither Day nor Spieth have played in a world ranking points-earning event since the US PGA Tour’s season finale, but Day’s incredible form  – which saw him win the Canadian Open, the US PGA Championship and two US PGA tour playoff events – has given him the No.1 ranking for the second time in his career.

“But in all seriousness while it is a little strange to get it this way it is just proof that the hard work we put in as a team this year paid off and at the end of the day every week at the top counts and is exciting.

“I know things will likely change again as I continue my off-season so I know I need to get back at it and work even harder than last year to make it easier to be at No.1 into the future.”