Wallace went for the green in two on the 18th leaving only 20 feet for an eagle.

Johnston laid up and had a longer putt for birdie, which he missed, and Wallace won when he tapped in from a foot.

"Since being three-over through eight in my first round, I've played some off my best golf," Wallace said.

Johnston shot a final-round 66, Wallace a 68.

They finished with 11-under totals of 277 at the DLF Golf and Country Club.

Wallace celebrates winning the playoff of The Hero Indian Open at DLF Golf and Country Club. PHOTO: Matthew Lewis/Getty Images.

Sihwan Kim of the US finished third after a 68, three strokes behind.

Hometown favourite Shubhankar Sharma faded on the back nine with a 75 to finish seven shots behind.

Sharma and Wallace shared the lead after the third round.

But Sharma bogeyed two of three holes on the back nine, including a double-bogey seven after an out-of-bounds tee shot on the 15th, to end his chances of winning his third European Tour event of the season.

Sharma already had a victory of sorts this week: He received a special invitation to play in the Masters at Augusta.

FINAL LEADERBOARD

The 21-year-old Sharma held the 54-hole lead in his first World Golf Championship appearance last week, in Mexico – finishing in a tie for ninth after a closing 74.

He was ranked No.462 in the world three months ago when he shot 61 in the second round and won the Joburg Open.

He closed with a 62 last month to win the Malaysian Open, making him the only two-time winner on the European Tour this season.