[2] In August 2018, he lost to Kim Koivu in a playoff for the Vierumäki Finnish Challenge and then had an exceptional end to the season.

[8] In July 2019, MacIntyre made his Open Championship debut at Royal Portrush, finishing in a tie for sixth.

[9] On 14 October, MacIntyre became the leading Scot on the Official World Golf Ranking for the first time after finishing in a tie for fourth at the Italian Open.

[11] In November 2020, MacIntyre claimed his first European Tour title at the Aphrodite Hills Cyprus Showdown.

[12] In September 2022, MacIntyre won his second European Tour event at the DS Automobiles Italian Open.

[14] In September, MacIntyre played on the European team in the 2023 Ryder Cup at Marco Simone Golf and Country Club in Guidonia, Rome, Italy.

The European team won 16.5–11.5 and MacIntyre went 2–0–1 including a win in his Sunday singles match against Wyndham Clark.

[16] One month later, MacIntyre won the Genesis Scottish Open with a birdie on the final hole to beat Adam Scott by one shot.