• Spieth says after John Deere Classic win: ‘I’ve plenty in the tank’
• World No2 admits he must ‘fine-tune my driver’ at St Andrews
The latest Jordan Spieth warning to the remainder of this week’s Open Championship field has arrived. The 21-year-old, who claimed his fourth victory of a stunning year at the John Deere Classic on Sunday, said in the aftermath that there is real scope for improvement.
Spieth triumphed in an Illinois play-off over Tom Gillis. On day three, the world No2 had scored a career-best 61. Concerns over Spieth choosing the PGA Tour rather than Scottish Open for his buildup to the third major of the year were therefore swatted aside. “I have got plenty in the tank,” the young Texan said. Spieth also insists better is to come.