Collin Morikawa was born in Los Angeles, on February 6, 1997, to Debbie and Blaine Morikawa, respectively of Chinese and Japanese origin, he began playing golf at the age of 5.

He studied at the University of California, Berkeley, where he played the sport from 2015 to 2019 before majoring in business administration.

He turns pro in 2019 by taking part in the Canadian Open, where he finishes in 14th place. In August 2020 he won the PGA Championship at his first attempt, then repeating his success in July 2021 with the victory of the British Open, again as a rookie.

This made him the first golfer in history to win two majors in his first outing.

The Californian also becomes the seventh golfer since 1900 to win the Open on debut, after Jock Hutchison (1921), Denny Shute (1933), Ben Hogan (1953), Tony Lema (1964), Tom Watson (1975) and Ben Curtis (2003), as well as setting a new Royal St. George's course record with 265 (the previous record of 267, set in 1993, was held by Greg Norman).

In 2021 he participates in the Games of the XXXII Olympics in Tokyo finishing third after the scheduled fourth rounds, but on an equal footing with nine other golfers. In the playoffs, however, he was overtaken by Pan Cheng-tsung finishing in fourth place.