The Frenchman has been based in nearby Dundee since last year and used all the links expertise he has gathered in his 18 months living on Scotland’s east coast to card a 70 over the Old Course at St Andrews and get to 22 under.
He and Southgate were tied at the top heading into the final day and they were still locked together on the 17th tee in a two horse race that ebbed and flowed throughout the afternoon.
A Southgate bogey on the penultimate hole handed Perez the initiative and the Englishman signed for a 71 to finish a shot back on the course where he had won the St Andrews Links Trophy as an amateur nine years previously.
Perez graduated from the European Challenge Tour after finishing third on the Rankings last season and now moves into the top 70 in the Official World Ranking and the top 20 in the Race to Dubai Rankings Presented by Rolex.
“The emotions were really high all day,” he said. “It was really cold and windy, a long day out there and I felt I was able to battle.
“It wasn’t easy, Matt played amazing. I was expecting some of the guys to charge and we were fortunate that it was kind of a one on one battle on the back nine.
“There’s nothing like a win. The confidence that you get from getting it done, it’s so difficult at this level to win. Being my first year, I’m obviously delighted.”
Tommy Fleetwood carded a closing 64 to finish three shots off the lead but his 39 under total alongside businessman Ogden Phipps saw the duo take home the team honours.
Rory McIlroy and dad Gerry also finished at 39 under but Fleetwood’s solo total sealed the win as McIlroy junior finished at 15 under in the solo event – closing his 67 with six straight birdies.
Matthew Jordan, Tom Lewis, Jordan Smith and Jeunghun Wang finished alongside Fleetwood at 19 under in the individual contest.
Perez and Southgate started the day at 20 under but a three putt from Southgate on the first quickly edged Perez ahead.
Both players took advantage of the par five fifth but Southgate then found another gear, hitting a stunning approach to four feet on the sixth and another excellent second into the next.
A tee shot to eight feet at the par three eighth had Perez back level but Southgate holed a 12 footer on the ninth to lead at the turn.
Perez three putted the 11th to put Southgate two ahead but there was a two shot swing on the par five 14th as a poor chip led to a Southgate bogey and Perez got down in two putts from off the green.
A Southgate three putt on the Road Hole led to another bogey and when both men parred the last, the champagne soaked celebrations belonged to Perez.
“I think I’ve proven to the world this week that when I do switch it on, I can mix it with the best and I’ve beaten a hell of a lot of good players this week,” said Southgate.
“I’m sure when it all comes out in the wash, I’ll be having a beer somewhere with a smile and some good friends and I’ll look back on this week as a huge success and a massive achievement in my career.”
Lagergren birdied the first, fifth and 11th but back to back bogeys on the next two meant he was five back with five to play. A hat-trick of birdies put him right back in contention but his chances disappeared with a bogey on the 17th after finding the road with his second.
The 17th also ended Waring’s chances when he found the Road Hole Bunker after making birdies on the first, fifth, 14th and 16th to go with a bogey on the second.
Lewis matched Fleetwood with a 64, while Jordan and Wang carded rounds of 68 and Smith signed for a 69.
Luke Donald, Tony Finau, Andrea Pavan, Richie Ramsay and Callum Shinkwin were 18 under.