[11] Edmund made his Davis Cup debut in the 2015 final, against Belgium, with Great Britain winning the tournament for the first time in 79 years.

[17][18] Initially cricket and swimming were his main childhood pursuits, but he switched to tennis at 10 after lessons at the David Lloyd Racquet and Fitness Club in Hull with coach Richard Plews.

When he was nearly 17, he based himself at the Lawn Tennis Association's National Training Centre in Roehampton to be coached by Colin Beecher, returning to see his family at weekends.

[24] Edmund made his first breakthrough on the Junior circuit in 2011, when he reached the semifinals of the US Open boys' singles event, where he was defeated by top seed and eventual runner-up Jiří Veselý of the Czech Republic.

Playing in the Great Britain Under 16 boys team, with Evan Hoyt and Luke Bambridge, they won the European Summer Cup defeating Italy in the final.

[25][26] Great Britain won the Junior Davis Cup tournament for the first time after beating Italy in the final in San Luis Potosí, Mexico.

Coached by Greg Rusedski, the team of Edmund, Evan Hoyt and Luke Bambridge justified their top seeding in the event.

[14][27] The following year he won his first junior Grand Slam title, at the boys' doubles event of the US Open, partnered by Portuguese player Frederico Ferreira Silva.

At the French Open, Edmund and Silva won their second Grand Slam title, defeating Chilean pair Cristian Garín and Nicolás Jarry in the final.

[28] It was a full year before Edmund played another Futures, again at the Great Britain F5 in Bournemouth, this time as a wild card in the main draw, but was beaten in the first round by Nicolas Rosenzweig.

[37] In the mixed doubles, he partnered fellow teenager Eugenie Bouchard, losing again in the first round to Frederik Nielsen and Sofia Arvidsson, again in straight sets.

[39] In January, Edmund received his first call-up to the Great Britain Davis Cup team for their World Group tie against the US, and was part of the initial nominations before being replaced by doubles specialist Dominic Inglot, meaning he was the first reserve singles player.

Edmund lost five consecutive first rounds and is believed to have concluded that Rusedski's other commitments would prevent him from putting in the necessary time at this key stage of his development.

He defeated Tristan Lamasine[44] from France and Austin Krajicek[45] of the US to reach the final round of qualifying, where he faced Australian wildcard Dane Propoggia.

[51] In the first round he faced Frenchman Stéphane Robert, and recorded his first ever Grand Slam level victory, as well as his first ever five-set match win.

[52] He was due to face Nick Kyrgios in the second round, but was forced to withdraw with a stomach injury, which it was feared could make him miss the entire grass court season if exacerbated.

[57] Edmund reacted to a disappointing autumn by parting company with his coach James Trotman, just five weeks ahead of the Davis Cup final.

[59] In November, the 20 year old Edmund won the Copa Fila Challenge title in Argentina on clay beating Brazil's Carlos Berlocq, ranked No 112 in the world and an expert on the surface.

[62] Edmund made his Davis Cup debut in the 2015 final versus Belgium in Ghent, playing the first singles match against Belgian Number 1 David Goffin, ranked No 16.

[65] In December, Edmund was invited to participate in the inaugural Tie Break Tens tournament at the Royal Albert Hall, with Andy Murray, Tim Henman, David Ferrer, John McEnroe and Xavier Malisse.

[12] Edmund accompanied Andy Murray at his training camp in Dubai, which included a trial period with British coach Ryan Jones.

[76] At the RBC Tennis Championships of Dallas, Edmund defeated Dan Evans in the first all-British Challenger final since 2005, when Alex Bogdanovic beat Mark Hilton.

[80] Edmund was Britain's top-ranked singles player for July's Davis Cup quarter final against Serbia in Belgrade, with Andy Murray choosing to sit out the tie following his Wimbledon victory.

[91] Edmund parted from coach Ryan Jones during the grass court season, and hired Mark Hilton, who became available following Dan Evans' drug ban.

[96] The week after, Edmund reached the second round of the Paris Masters, saving match point to beat Evgeny Donskoy[97] before losing to eventual champion Jack Sock after leading 5–1 against him in the final set.

[103] Edmund went on to eliminate Denis Istomin[104] in straight sets, and then Nikoloz Basilashvili[105] in another five-setter to reach round four, where he beat Andreas Seppi[106] to make his first Grand Slam quarterfinal.

At the 2018 French Open, Edmund defeated Alex de Minaur and Márton Fucsovics en route to reaching the 3rd round for the second year running.

Just days later, Edmund headed to Vienna where his good form continued with an excellent win over Diego Schwartzman[131] but he was ousted in the next round by Fernando Verdasco.

[149] In June 2024, he returned to his home Slam 2024 Wimbledon Championships after four years of absence in singles and six in men's doubles to play with compatriot Oliver Crawford.

[154][155] Notable weaknesses of Edmund's game are his fitness and movement, but these have also improved in recent years, demonstrated by his deeper runs at Grand Slams.