Jordan Spieth’s tee shot on the par-5 17th hole landed in the trees. A little thing called the Grand Slam.

Spieth made par for his second win at TPC Deere Run in three years and improved to 3-2 in playoffs in his career.

Nevertheless, Spieth believes he still needs to make a few tweaks to his game before his assault at the Home of Golf at St Andrews.

And as he showed on Saturday, Spieth doesn’t have a problem hitting his intended target. And he still won.

“It feels great. The memories that we have here, and then to go back into a playoff, we were reliving some of the conversations”, said Spieth of his talking to his caddie Michael Greller. “So I can do it again”. Spieth roared back into contention with four birdies in five holes, including a 21-foot chip from the fringe on No. 16. But he shot 64-61 in between, 20 under par and good for a spot in the playoff. However, the young Dallas native was tested mightily, getting off to a cold start on Sunday to let 46-year-old Tom Gillis, who has never won on the PGA Tour, jump to the lead, with Danny Lee, last week’s victor at the Greenbrier Classic in West Virginia for his first PGA victory, close behind.

Playing partner Spieth was also struggling early, shooting even-par on the front nine.

Raphael Jacquelin of France birdied the last hole for 70 to tie for second place with Kuchar, and claim one of three British Open places on offer.

“When I first struck it, I thought it might be flying way too far”, Spieth said. He finished at 19-under-par, a stroke behind Gillis and Spieth.

John Deere Classic Final Round Recap, Highlights and Scores [VIDEO].

“Walking up after the second shot, I said ‘Mike, I just saw the board and I think this is for my lowest round on the PGA TOUR”, Spieth said on www.pgatour.com. I love the Himalayas putting green.

He was quoted by Sky Sports, saying: “I committed to this event well ahead of time, and it never really crossed my mind to drop out”. Zach Johnson was six under today, through the fourteenth hole, nineteen under overall, and in second position. Johnson hit all 14 fairways off the tee, and made 138 feet of putts. He beat out Tom Gillis in a sudden-death playoff. Gillis is 643rd in the Official World Golf Rankings.

Spieth had a 30-foot putt for the victory on No. 18, but he pushed it left.

Spieth had a chance to finish the contest at the first play-off hole, but lipped his birdie putt.