2012: Grand Slam doubles debut and quarterfinal

In July, Christian made it to the quarterfinals of the Lexington, Kentucky Challenger event.^[1] Christian was awarded a wildcard into the 2012 US Open to play doubles alongside Ryan Harrison, where they reached the quarterfinals.

2013

Earlier in the year he reached the quarterfinals, semifinals, the final, and won, respectively, the four Futures events in which he participated. He failed to qualify in Indian Wells, losing in the first round of qualifying to Ernests Gulbis, who made a deep run to the fourth round after qualifying. However, he did take a set off Gulbis. Harrison won his first ATP World Tour match against Alejandro Falla at the BB&T Atlanta Open. He then lost in the next round to John Isner in three tight sets.

2014–15

Harrison spent 2014 and 2015 recovering from several surgeries.

2016–2018: Grand Slam singles and Masters 1000 debut

Harrison reached the final round of qualifying at the 2016 US Open after beating Luke Saville and second seed Konstantin Kravchuk in two three-set matches. He made it into main draw after beating Steven Diez also in three-set match. He was one set down at all three matches in qualifying. He lost in the first round to Paul-Henri Mathieu in straight sets.

He made his Masters 1000 debut at the 2017 Miami Open. He received a wildcard to the 2017 US Open where he won his first round match in doubles with partner Christopher Eubanks.

2021: Maiden ATP doubles final

Harrison qualified for the 2021 Delray Beach Open, starting the week ranked No. 789 in the world.^[2] He beat number 1 seed Cristian Garín^[3] and advanced all the way to the semifinals,^[4] where he was defeated by fourth seed Hubert Hurkacz,^[5] who would later win the title. As a result, he climbed 444 positions in the rankings to a World No. 345 ranking on 18 January 2021 and he got five ATP Tour match victories thus far, with three of them in Delray Beach, where he also won two matches in qualifying. He also reached his maiden ATP final in doubles with his brother Ryan Harrison where they lost to Ariel Behar and Gonzalo Escobar.^[6] As a result, he returned to the top 250 in the doubles rankings at World No. 229.

2022: First Wimbledon qualification since 2018 and win

He qualified for only the second time at the 2022 Wimbledon Championships and his third Major main draw and won his first match at any Major, defeating wildcard Jay Clarke.^[7]

Doubles: 1 (1 runner-up)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jan 2021	Delray Beach Open, United States	250 Series	Hard	Ryan Harrison	Ariel Behar Gonzalo Escobar	7–6(7–5), 6–7(4–7), [4–10]

Close

Singles: 10 (5–5)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jan 2013	Great Britain F2, Preston	Futures	Hard (i)	Edward Corrie	6–2, 3–6, 5–7
Win	1–1	Feb 2013	Great Britain F3, Sheffield	Futures	Hard (i)	Edward Corrie	6–4, 2–6, 7–6(7–5)
Loss	1–2	May 2013	USA F13, Tampa	Futures	Clay	Austin Krajicek	Walkover
Win	2–2	Aug 2016	USA F27, Champaign	Futures	Hard	Rhyne Williams	6–7(2–7), 6–3, 6–4
Win	3–2	Jul 2017	USA F21, Tulsa	Futures	Hard	Tommy Paul	3–6, 6–2, 6–1
Win	4–2	Jul 2017	USA F23, Wichita	Futures	Hard	Michael Mmoh	1–6, 6–2, 7–5
Loss	4–3	May 2018	Savannah, USA	Challenger	Clay	Hugo Dellien	1–6, 6–1, 4–6
Loss	4–4	Feb 2021	M25 Naples, USA	World Tennis Tour	Clay	Clément Tabur	1–6, 6–1, 3–6
Win	5–4	Feb 2021	M25 Naples, USA	World Tennis Tour	Clay	Corentin Denolly	6–4, 6–2
Loss	5–5	Apr 2022	Savannah, USA	Challenger	Clay	Jack Sock	4–6, 1–6

Close

Doubles: 14 (10–4)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jun 2013	Fürth, Germany	Challenger	Clay	Michael Venus	Colin Ebelthite Rameez Junaid	4–6, 5–7
Loss	0–2	Apr 2018	Sarasota, USA	Challenger	Clay	Peter Polansky	Evan King Hunter Reese	1–6, 2–6
Loss	0–3	Oct 2020	M25 Pardubice, Czech Republic	World Tennis Tour	Clay	Toby Kodat	Martín Cuevas Agustín Velotti	6–3, 3–6, [6–10]
Loss	0–4	Apr 2021	Orlando, USA	Challenger	Hard	Dennis Novikov	Jack Sock Mitchell Krueger	6–4, 5–7, [11–13]
Win	1–4	Jun 2021	Orlando, USA	Challenger	Hard	Peter Polansky	JC Aragone Nicolás Barrientos	6–2, 6–3
Win	2–4	Jul 2021	Cary, USA	Challenger	Hard	Dennis Novikov	Petros Chrysochos Michail Pervolarakis	6–3, 6–3
Win	3–4	Apr 2022	Tallahassee, USA	Challenger	Clay	Gijs Brouwer	Diego Hidalgo Cristian Rodríguez	4–6, 7–5, [10–6]
Win	4–4	May 2022	Little Rock, USA	Challenger	Hard	Andrew Harris	Robert Galloway Max Schnur	6–3, 6–4
Win	5–4	Feb 2023	Tenerife, Spain	Challenger	Hard	Shintaro Mochizuki	Francesco Passaro Matteo Gigante	6–4, 6–3
Win	6–4	Feb 2023	Tenerife, Spain	Challenger	Hard	Andrew Harris	Luke Johnson Sem Verbeek	7–6(8–6), 6–7(4–7), [10–8]
Win	7–4	Jul 2023	Granby, Canada	Challenger	Hard	Miķelis Lībietis	Tristan Schoolkate Adam Walton	6–4, 6–3
Win	8–4	Feb 2024	Pau, France	Challenger	Hard (i)	Brandon Nakashima	Romain Arneodo Sam Weissborn	7–6(7–5), 6–4
Win	9–4	Feb 2024	Lille, France	Challenger	Hard (i)	Marcus Willis	Titouan Droguet Giovanni Mpetshi Perricard	7–6(8–6), 6–3
Win	10–4	Apr 2024	Savannah, USA	Challenger	Clay	Marcus Willis	Simon Freund Johannes Ingildsen	6–3, 6–3

Close