Weir was fortunate in that his godfather's son played left-handed and had a partial set of spare clubs that he handed down to Weir—three woods and four irons.

[5] While working at Huron Oaks, he also met Jack Nicklaus at age 11, when the golf legend came to the club to play an exhibition.

[6] Weir gave up hockey in his early teenage years when he realized he would not grow past average size and that golf was his best sport.

Nicklaus quickly wrote back and told Weir, "If you are a good player left-handed, don't change anything—especially if that feels natural to you.

He is a graduate of Brigham Young University (majoring in Recreation Management), and won the Ontario Amateur Championship in 1990 and 1992.

Weir began the 2003 season in impressive fashion, winning two tournaments on the West Coast Swing.

He first won the Bob Hope Chrysler Classic in Palm Springs, California, and then followed with a win at Riviera Country Club near Los Angeles, at the Nissan Open.

Weir is a right-hander who plays golf left-handed, a trait he shares with fellow PGA Tour pro and major champion Mickelson.

In February 2004, Weir joined the ranks of a select few players including Ben Hogan to win consecutive championships at the Nissan Open, becoming the sixth player in Nissan Open history to notch back-to-back wins, and the first since Corey Pavin (1994, 1995).

Working with Mike Bennett and Andy Plummer on a new swing showed some positive results (two top tens, including a tie for eighth at the Open Championship).

While working on the swing changes, he had dipped in the world rankings to a point that he did not automatically qualify for the Presidents Cup matches in 2007, held at the Royal Montreal Golf Club.

He got to play in the tournament he helped bring to Canada because he was picked by International team captain Gary Player as one of his discretionary selections.

[11] This turned out to be an inspired choice as Weir went on to beat current number one Tiger Woods in a heated match, despite his team losing the Cup.

"[12] His swing changes, coupled with the momentum from his Presidents Cup performance, culminated in his first win in over three years at the Fry's Electronics Open in October 2007.

Golf Digest magazine of March 2010 reported that Weir had returned to work with instructor Mike Wilson, who was his coach during his most successful period in the early 2000s.

Though Weir missed the FedEx Cup playoffs, he finished inside the top 125 on the money list, which left him exempt for the 2014–15 season.

Creekside Estate Winery, near Lincoln, Ontario, began producing wine for Weir in 2005, and as of 2007 had released a Merlot, Chardonnay, Sauvignon blanc, Cabernet-Merlot, Cabernet-Shiraz and Icewine.

His Icewine Vidal was named by Travel + Leisure Golf magazine as one of its top five golf-related wines.

[27][28] Weir withdrew from the 2015 RBC Canadian Open, and took an indefinite leave of absence from golf competition, according to a statement he posted Friday, July 17, 2015, on his Twitter account.