Leona Maguire held the world amateur number one ranking longer than anybody else – for 135 weeks in total between May 2015 and February 2018 – although that record was eventually broken by Rose Zhang in April 2023.
A highlight of Maguire's amateur career was lifting the Smyth Salver at the AIG Women's Open at Woburn in 2016, finishing in a tie for 25th.
Her joint-sixth at the 2021 Evian Championship was highlighted by a closing 10-under 61, which equalled the lowest-ever round in a major by a man or woman set two days earlier by Jeong-eun Lee. That led to a first Solheim Cup cap as a wildcard pick by captain Catriona Matthew and in Europe’s dramatic victory she was the star of the show, earning 4½ points out of a possible five. It was the best-ever performance by a Solheim Cup rookie.
Her progress continued when she posted a career-best major finish in the AIG Women's Open at Muirfield in 2022, tying for fourth place. Her final round of 66 included an eagle on the par-5 5th hole, and was the lowest of the Sunday.
Maguire is a two-time winner on the LPGA Tour, having won the 2022 Drive On Championship and the Meijer LPGA Classic in 2023.
She became the first Irishwoman to be victorious on the Ladies European Tour when she produced an eagle on the 72nd hole to win the Aramco Team Series event in London in July 2024.
Alongside her twin sister Lisa, Maguire she represented Europe in both the Junior Ryder Cup – a mixed event – and two Junior Solheim Cups before they both turned professional in 2018.