The Englishman, who moves to 14th in the Race to Dubai Rankings, finished with a superb round of 68 to set up a play-off with fellow countryman Johnston, who had carded a final round 66 to reach 11 under par. Wallace claimed victory at the first play-off hole, thanks to an excellent second shot and a two-putt, with Johnston’s long birdie putt narrowly missing.
The win saw the 27 year old pick up 291,660 points, which takes his season-tally to 377,390. Wallace will hope to kick on as he aims for a DP World Tour Championship debut in November.
"I played great,"said Wallace. "Ever since I was three over through eight at the start of the week, I've played some of the best golf of my life and to do it in style at the end in the play-off capped it off.
"Beef really had a great round today, because I was playing fantastic so I thought I might have been a few more clear. His putt on the last should have gone in. I guess it’s just my day today."
Nick Tarratt, Director European Tour International, Dubai Office, said, “Many congratulations to Matt on the second European Tour victory of his career after his win in Portugal last year."
"He’s making wonderful progress in the game and if he can continue this form he is in with a great chance of making his first DP World Tour Championship appearance at Jumeriah Golf Estates in November."
Johnston’s runner-up finish gains him 194,440 points, which moves the 29 year old up to 17th from 50th in the Race to Dubai Rankings with a season total of 320,293.
Meanwhile, Spaniard Pablo Larrazábal and Austrian Matthias Schwab finished tied for fourth with both men picking up 80,850 points. Larrazábal’s season tally now stands at 327,537 which takes him from 19th to 15th, whilst Schwab’s total of 103,283 saw him make great strides from 188th to 68th in the Rankings.
Scotland’s Stephen Gallacher made his way into the Race to Dubai’s all-important top 60 after a tied seventh place saw him pick up 48,125 points to move him from 87th to 51st with a season tally of 127,741.
The top three in the Race to Dubai Rankings remains the same despite Tommy Fleetwood and Tyrrell Hatton not playing in India. Indian star Shubhankar Sharma continues to lead the way with 978,198 points, after picking up 48,125 points for a tied seventh place finish at the DLF Golf & Country Club. Last year’s Race to Dubai winner Fleetwood sits in second place with a total of 755,253, whilst compatriot Hatton completes the top three with 739,700 points.
The DP World Tour Championship, Dubai takes place at Jumeirah Golf Estates from November 15-18.