He has also won two important pairs events, representing Denmark; the 2016 World Cup of Golf with Søren Kjeldsen and the 2017 GolfSixes with Lucas Bjerregaard.

During his début season he claimed his first Challenge Tour title at The Princess, held in Sweden at the beginning of July.

In December 2010, Olesen tied for second place at the Alfred Dunhill Championship, the first tournament of the 2011 European Tour season.

This was equaled in June 2011, when Olesen tied for second at the BMW Italian Open in Turin, mostly due to a 10-under-par round of 62 on the final day, but still coming up short by one stroke of Englishman Robert Rock.

[11] In February 2023, Olesen won the Thailand Classic for his seventh European Tour victory.

[13] On 29 July 2019, Olesen was arrested on suspicion of sexual assault on a British Airways flight.

[17] In July 2020, the European Tour lifted the suspension because his court date, original scheduled for 11 May 2020, was postponed until December 2021 due to the COVID-19 pandemic.

QF, R16, R32, R64 = Round in which player lost in match play "T" = tied Amateur Professional