2008–2009

2008 was a good year for Henderson, reaching the semi-finals of the Norway Open and the quarter-finals of the WDF Europe Cup. On 20 September 2008 Henderson captured his very first title, winning the 2008 British Open. He scored notable wins over Edwin Max and Dave Chisnall to earn a spot into the televised stages which were shown live on Setanta Sports. He then defeated Gary Robson in the quarter-finals and Mareno Michels in the semis before avenging his defeat over Anderson twelve months previously by beating him in the final to win the £3,000 top prize. The win also helped Henderson finish fourth in the BDO International Grand Prix, earning him another £2,750 for his efforts. He also shot up the world rankings as a result of the win, moving him into the WDF's top 20. He then captured the German Open in 2009, beating Stephen Bunting in the final which elevated Henderson to seven in the WDF rankings.

2010–2011

Henderson then qualified for the 2010 BDO World Championship, winning one of four places available from the Inter-Playoff Qualifiers in Bridlington. He was defeated in the second round by Scott Waites. Henderson failed to qualify for the 2011 tournament, but did qualify for the 2010 Grand Slam of Darts where he finished third in his group. After being defeated by Mervyn King he was accused of standing in front of the oche, however after watching the match again, King admitted that he had over-reacted and apologised to Henderson in a pre-match interview.

On 15 January 2011, Henderson came through qualifying at the PDC Q-School event and has therefore left the British Darts Organisation. On joining the PDC he said "It means everything to me the first two days were hard and I felt a lot of pressure today but to qualify, so I'm delighted I did it."

In the 2011 Derby championships, Henderson hit a nine-darter in his second leg of the second round beating Andy Hamilton 6–5 and earning £800.^[2]

Henderson qualified for the 2011 World Matchplay where he beat Colin Lloyd 10–7 in the first round, before losing to Andy Hamilton 13–11 in the second round.^[3] He defeated on form Justin Pipe 2–0 at the World Grand Prix 2011, he went on to reach the quarter finals losing to eventual runner up Brendan Dolan

2012 - 2020

Henderson reached his first PDC World Championship in 2012, but was beaten by three-time World Champion, John Part, 0–3. He only managed to win 2 legs during the match, with Part stating afterwards that "John struggled and wasn't himself".^[4] His best result on the 2012 Pro Tour was in reaching the quarter-finals of the 16th Players Championship event, where he lost to Nick Fullwell 2–6.^[5] Henderson was beaten in the last 16 of the Qualifier for the 2013 World Championship.^[6] He was ranked world number 39 after the World Championship.^[7]

Henderson qualified for the 2013 UK Open by finishing 50th on the Order of Merit to enter the event in the second round.^[8] He enjoyed his best ever run in the tournament by beating Dave Place, Scott Rand and Kevin McDine to advance to the last 16.^[9] He played James Wade and lost 9–4.^[10] Henderson reached the quarter-finals of a Players Championship played in Killarney for the second consecutive year as he beat Mark Webster, Ian White and Justin Pipe before being whitewashed 6–0 by Darren Webster.^[11] He qualified for the 2014 World Championship through the ProTour Order of Merit having claimed the ninth of sixteen places that were available to non-qualified players.^[12] Henderson started his first round match brightly as he took a 2–0 lead against seventh seed Dave Chisnall which included a 132 finish of bull, bull, double 16. He threw for the match in the third set but lost the leg and the set as Chisnall fought back to level the game. Henderson survived four match darts from Chisnall in the final set as he pulled off a big shock win in a performance he rated as the best of his career.^[13] Another tight match followed against Mark Webster with Henderson missing three darts at tops to seal a 4–2 win, and then went on to lose the deciding set to bow out of the tournament 4–3.^[14]

At the 2014 UK Open, Henderson was beaten 5–1 by Jelle Klaasen in the second round.^[15] He beat Steve Hine 6–4, Peter Wright 6–5 and Simon Whitlock 6–2 (with an average of 106.12) to reach the quarter-finals of the German Darts Masters, where he lost 6–2 against Adrian Lewis.^[16] In the rest of the year he lost in the last 16 of two Players Championships and qualified for three European Tour events, losing in the second round in two and the opening round of the other.^[17]

The opening four sets in Henderson's first round 2015 World Championship match against Vincent van der Voort went with throw to send it into a deciding set. Van der Voort hit a crucial 157 finish with Henderson waiting on 80 for the match and from there the Dutchman won back-to-back 14 dart legs to knock him out.^[18] A pair of last 16 finishes helped Henderson enter the UK Open at the third round stage and he eliminated Steve Douglas 9–7 and then retained his composure when Daryl Gurney won five legs in a row to lead 8–7 by beating him 9–8.^[19] This matched Henderson's best ever run the event, but it came to a sudden end when he lost 9–2 against Peter Wright.^[20] At the German Darts Masters, Henderson defeated Michael Smith 6–4 and then averaged 102.48 in a 6–0 whitewash over Andrew Gilding.^[21] He improved upon that in the quarter-finals by averaging 107.72 during a 6–1 victory against Brendan Dolan and knocked out Adrian Lewis 6–4 to reach his first PDC final. Henderson played world number one Michael van Gerwen and he sent the match into a final leg decider, after being 3–0 down, which he lost without getting a dart for the title.^[22] He suffered first round exits at the World Matchplay (10–2 to Phil Taylor) and the World Grand Prix (2–0 in sets to Gary Anderson), but then defeated Robert Thornton 6–4 at the European Championship.^[23][24] Henderson then took advantage of a poor performance from Rowby-John Rodriguez in the second round to thrash him 10–2 and reach his first major quarter-final in over four years, where he lost 10–4 to Peter Wright.^[25]

After taking the opening set in his first round match at the 2016 World Championship, Henderson went on to lose 3–1 against Darren Webster.^[26] One semi-final and a quarter-final appearance in the qualifiers helped him finish 17th on the Order of Merit for the UK Open.^[27] Henderson saw off Magnus Caris 9–4, before losing 9–6 to Adrian Lewis in the fourth round.^[28] His second semi-final of the year was at the 14th Players Championship event and he was knocked out 6–4 by Michael van Gerwen.^[29] He was ousted 6–3 by Gary Anderson in the first round of the Players Championship Finals.^[30]

He won the opening two sets against Andrew Gilding in the first round of the 2017 World Championship, before it was levelled at 2–2. Henderson missed one match dart in the deciding set and it would eventually go to a sudden-death leg. Gilding won the bull to throw first and took the leg to eliminate Henderson.^[31]

Following Gary Anderson's withdrawal from the 2019 Premier League, Henderson was selected as one of nine 'contenders' to replace him. A great boost for his Red Army following of his fellow Aberdeen FC fans. He played a one-off match against No. 1 PDC-ranked Michael van Gerwen on night five in Aberdeen. The match resulted in a draw.^[32]

Henderson returned to the Premier League in 2020 under the new tag of 'Challenger', once again in Aberdeen. However, he was beaten by Nathan Aspinall.^[33]

2021

Henderson, alongside Peter Wright, won the 2021 PDC World Cup of Darts playing on behalf of Scotland. It was his first PDC Major Tournament win.^[34]

2022

Henderson failed to qualify for 2022 PDC World Darts Championship, missing this event for the first time since 2013. He continued to struggle on Pro Tour, but was again nominated for 2022 PDC World Cup of Darts, where he was defending the title alongside Peter Wright. Together they made it to the Quarterfinals, where they lost against England. At the end of the season he dropped out of top 64 of PDC Order of Merit, failing to qualify for the World Championship second time in the row and lost his Tour Card after the season 2022.

2023

He was not able to retain his Tour card in UK Q-School and played on PDC Challenge Tour. He secured two titles during the year and was battling for the second place in PDC Challenge Tour Order of Merit. After losing in an early round of the last PDC Challenge Tour event, Henderson had to hope that Andy Boulton, Cam Crabtree and Owen Bates would not make the final. Boulton and Crabtree dropped out at the last sixteen. Despite facing multiple match darts against Michael Warburton, Bates made it to the final and clinched the second place, therefore Henderson did not get his Tour card via PDC Challenge Tour for just £175, placing 3rd overall in the rankings. ^[35]

2024

Unable to win his Tour card back in UK Q-School, Henderson continued playing PDC Challenge Tour in 2024. He also accepted the invitation for 2024 World Seniors Darts Championship. He has become the World Seniors Darts champion at the first time of asking, competing in the event for the first time, defeated Colin McGarry 5-0 in the final. ^[36]

BDO

• 2005: Second round (lost to Martin Adams 2–3)
• 2010: Second round (lost to Scott Waites 1–4)

PDC

• 2012: First round (lost to John Part 0–3)
• 2014: Second round (lost to Mark Webster 3–4)
• 2015: First round (lost to Vincent van der Voort 2–3)
• 2016: First round (lost to Darren Webster 1–3)
• 2017: First round (lost to Andrew Gilding 2–3)
• 2018: Third round (lost to Rob Cross 1–4)
• 2019: Third round (lost to Michael Smith 2–4)
• 2020: Third round (lost to Gerwyn Price 0–4)
• 2021: Second round (lost to Jonny Clayton 1–3)

PDC European tour finals: (1 runner-up)

More information Outcome, No. ...

Outcome	No.	Year	Championship	Opponent in the final	Score
Runner-up	1.	2015	German Darts Masters	Michael van Gerwen	5–6 (l)

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PDC team finals: 1 (1 title)

More information Outcome, No. ...

Outcome	No.	Year	Championship	Team	Teammate	Opponents in the final	Score[N 1]
Winner	1.	2021	World Cup of Darts	Scotland	Peter Wright	Austria – Mensur Suljović and Rowby-John Rodriguez	3–1 (m)

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