Graeme McDowell will announce details of a major new sponsorship deal next week.
The US Open champion, who was awarded an MBE in the Queen’s New Year’s honours list, did not renew his staff contract with club sponsors Callaway when it ran out on Friday.
McDowell’s image has been removed from the list of staff players on the Callaway website and he is expected to sign a deal with Cleveland/Srixon believed to be worth in excess of $1.5m a year.
The pair have been “drawn” together for the first two rounds of the PGA Tour’s curtain-raising Hyundai Tournament of Champions at the Kapalua Resort on Maui.
McDowell beat Mahan 3 and 1 in the decisive singles when he birdied the 16th and the American conceded after a fluffed chip led to a bogey at the next.
The pairing is a boost for the exclusive $5.6m event as McDowel is the only major winner who has bothered to make the trip and battle for a top prize of $1.12 million (€837,000).
Tournament director Nancy Cross said in a statement: “As a golf fan, one of the most compelling moments of 2010 was their final-day match up during the Ryder Cup.
“To have these two paired together for the start of the season … well, we couldn’t have scripted it better.”
The event is limited to last season’s winners but players like Masters champion Phil Mickelson, Quail Hollow winner Rory McIlroy, Open champion Louis Oosthuizen and US PGA Martin Kaymer have all turned down the chance to pick up last place prize money of $70,000.
US Open champion McDowell rounded of his “dream year” by accepting an MBE from the Queen for “services to golf”, securing a visit to Buckingham Palace at some stage in 2011.
The first European winner of the US Open in 40 years, McDowell said: “It is a huge honour for me to be included on the New Year Honours List.
“For my achievements as a professional golfer to be recognised in this way is truly special. Both myself and my family are very proud of this unique acknowledgement.”