|   Jinan challenger | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 08.10. | 
			  | 
			Draxl L. - O'Connell C. | 
			1R | 
			4-6, 1-1 | 
			2.22 | 
			1.61 | 
		
		
			|   Shanghai | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 04.10. | 
			  | 
			Shapovalov D. - O'Connell C. | 
			2R | 
			6-3, 6-2 | 
			1.41 | 
			2.91 | 
		
		
			| 02.10. | 
			  | 
			O'Connell C. - Dzumhur D. | 
			1R | 
			6-2, 6-4 | 
			1.62 | 
			2.27 | 
		
		
			|   Beijing | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 23.09. | 
			  | 
			Van De Zandschulp B. - O'Connell C. | 
			Q-R16 | 
			6-2, 6-2 | 
			1.69 | 
			2.10 | 
		
		
			|   Chengdu | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 21.09. | 
			  | 
			Tabilo A. - O'Connell C. | 
			QF | 
			4-6, 7-5, 6-2 | 
			1.50 | 
			2.58 | 
		
		
			| 19.09. | 
			  | 
			O'Connell C. - Zhou Y. | 
			R16 | 
			6-2, 6-4 | 
			1.49 | 
			2.58 | 
		
		
			| 17.09. | 
			  | 
			O'Connell C. - Halys Q. | 
			1R | 
			63-7, 6-3, 6-4 | 
			1.90 | 
			1.86 | 
		
		
			|   Guangzhou 2 challenger | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 13.09. | 
			  | 
			Tabilo A. - O'Connell C. | 
			SF | 
			2-1 | 
			1.78 | 
			1.95 | 
		
		
			| 12.09. | 
			  | 
			O'Connell C. - Sharipov M. | 
			QF | 
			6-4, 6-4 | 
			1.34 | 
			3.09 | 
		
		
			| 11.09. | 
			  | 
			O'Connell C. - Eubanks C. | 
			R16 | 
			3-6, 6-3, 6-4 | 
			1.44 | 
			2.65 | 
		
		
			| 09.09. | 
			  | 
			O'Connell C. - Te R. | 
			1R | 
			6-4, 6-4 | 
			1.08 | 
			7.02 | 
		
		
			|   US Open | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 26.08. | 
			  | 
			De Minaur A. - O'Connell C. | 
			1R | 
			6-3, 6-4, 6-4 | 
			1.04 | 
			11.75 | 
		
		
			|   Winston Salem | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 19.08. | 
			  | 
			Bautista-Agut R. - O'Connell C. | 
			2R | 
			6-4, 0-0 | 
			1.57 | 
			2.36 | 
		
		
			| 18.08. | 
			  | 
			O'Connell C. - Safiullin R. | 
			1R | 
			6-3, 6-3 | 
			2.53 | 
			1.51 | 
		
		
			|   Toronto | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 02.08. | 
			  | 
			De Minaur A. - O'Connell C. | 
			3R | 
			 | 
			  | 
			  | 
		
		
			| 31.07. | 
			  | 
			O'Connell C. - Tsitsipas S. | 
			2R | 
			6-4, 4-6, 6-2 | 
			2.95 | 
			1.39 | 
		
		
			| 28.07. | 
			  | 
			O'Connell C. - Tseng C. | 
			1R | 
			6-1, 6-2 | 
			1.63 | 
			2.26 | 
		
		
			|   Washington | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 21.07. | 
			  | 
			Quinn E. - O'Connell C. | 
			1R | 
			6-3, 6-2 | 
			1.53 | 
			2.48 | 
		
		
			|   Wimbledon | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 30.06. | 
			  | 
			Mannarino A. - O'Connell C. | 
			1R | 
			6-2, 6-4, 6-3 | 
			1.40 | 
			2.93 | 
		
		
			|   Eastbourne | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 21.06. | 
			  | 
			Monday J. - O'Connell C. | 
			Q-R16 | 
			6-3, 2-6, 6-4 | 
			2.42 | 
			1.54 | 
		
		
			|   Queen's Club | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 16.06. | 
			  | 
			Rune H. - O'Connell C. | 
			1R | 
			6-3, 6-4 | 
			1.19 | 
			5.48 | 
		
		
			| 15.06. | 
			  | 
			Bolt A. - O'Connell C. | 
			Q-QF | 
			3-6, 7-64, 6-3 | 
			1.79 | 
			2.00 | 
		
		
			| 14.06. | 
			  | 
			O'Connell C. - Duckworth J. | 
			Q-R16 | 
			7-64, 6-0 | 
			2.30 | 
			1.58 | 
		
		
			|   Hertogenbosch | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 11.06. | 
			  | 
			Mannarino A. - O'Connell C. | 
			1R | 
			6-1, 6-3 | 
			1.67 | 
			2.19 | 
		
		
			|   Birmingham challenger | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 03.06. | 
			  | 
			Moreno De Alboran N. - O'Connell C. | 
			1R | 
			6-4, 6-3 | 
			2.90 | 
			1.38 | 
		
		
			|   French Open | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 26.05. | 
			  | 
			Humbert U. - O'Connell C. | 
			1R | 
			7-5, 6-3, 7-63 | 
			1.50 | 
			2.58 | 
		
		
			|   Hamburg | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 17.05. | 
			  | 
			Ymer E. - O'Connell C. | 
			Q-R16 | 
			6-2, 3-6, 6-4 | 
			3.27 | 
			1.33 | 
		
		
			|   Rome | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 07.05. | 
			  | 
			Norrie C. - O'Connell C. | 
			1R | 
			6-3, 6-2 | 
			1.57 | 
			2.38 | 
		
		
			|   Madrid | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 25.04. | 
			  | 
			Fritz T. - O'Connell C. | 
			2R | 
			6-1, 6-4 | 
			1.26 | 
			3.83 | 
		
		
			| 23.04. | 
			  | 
			O'Connell C. - Ugo Carabelli C. | 
			1R | 
			6-3, 6-4 | 
			2.27 | 
			1.63 | 
		
		
			|   Munich | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 15.04. | 
			  | 
			Darderi L. - O'Connell C. | 
			1R | 
			7-63, 7-63 | 
			1.65 | 
			2.25 | 
		
		
			| 12.04. | 
			  | 
			Tseng C. - O'Connell C. | 
			Q-R16 | 
			6-3, 6-2 | 
			2.41 | 
			1.54 | 
		
		
			|   Bucharest | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 04.04. | 
			  | 
			Fucsovics M. - O'Connell C. | 
			QF | 
			6-0, 6-4 | 
			1.51 | 
			2.55 | 
		
		
			| 03.04. | 
			  | 
			O'Connell C. - Jarry N. | 
			R16 | 
			6-2, 5-7, 7-65 | 
			1.80 | 
			1.99 | 
		
		
			| 01.04. | 
			  | 
			O'Connell C. - Lajovic D. | 
			1R | 
			6-4, 6-3 | 
			2.40 | 
			1.56 | 
		
		
			|   Miami | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 19.03. | 
			  | 
			Carballes Baena R. - O'Connell C. | 
			1R | 
			6-3, 3-6, 7-65 | 
			2.50 | 
			1.53 | 
		
		
			| 18.03. | 
			  | 
			O'Connell C. - Trungelliti M. | 
			Q-2R | 
			6-2, 6-3 | 
			1.12 | 
			5.99 | 
		
		
			| 17.03. | 
			  | 
			O'Connell C. - Draxl L. | 
			Q-1R | 
			7-5, 6-0 | 
			1.39 | 
			2.85 | 
		
		
			|   Indian Wells | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 07.03. | 
			  | 
			Berrettini M. - O'Connell C. | 
			2R | 
			6-2, 7-62 | 
			1.21 | 
			4.36 | 
		
		
			| 05.03. | 
			  | 
			O'Connell C. - Carballes Baena R. | 
			1R | 
			6-3, 0-6, 6-1 | 
			1.75 | 
			2.07 | 
		
		
			|   Dubai | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 26.02. | 
			  | 
			Berrettini M. - O'Connell C. | 
			R16 | 
			7-62, 6-2 | 
			1.28 | 
			3.70 | 
		
		
			| 25.02. | 
			  | 
			O'Connell C. - Dimitrov G. | 
			1R | 
			6-0 | 
			2.99 | 
			1.38 | 
		
		
			| 23.02. | 
			  | 
			O'Connell C. - Van De Zandschulp B. | 
			Q-QF | 
			7-65, 6-4 | 
			2.55 | 
			1.49 | 
		
		
			| 22.02. | 
			  | 
			O'Connell C. - Al Janahi A. | 
			Q-R16 | 
			6-2, 6-0 | 
			1.01 | 
			12.25 | 
		
		
			|   Doha | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 19.02. | 
			  | 
			Draper J. - O'Connell C. | 
			R16 | 
			6-2, 6-1 | 
			1.20 | 
			4.47 | 
		
		
			| 17.02. | 
			  | 
			O'Connell C. - Habib H. | 
			1R | 
			7-67, 7-63 | 
			1.32 | 
			3.38 | 
		
		
			| 16.02. | 
			  | 
			O'Connell C. - Kotov P. | 
			Q-QF | 
			6-4, 6-2 | 
			1.40 | 
			2.86 | 
		
		
			| 15.02. | 
			  | 
			O'Connell C. - Watanuki Y. | 
			Q-R16 | 
			63-7, 7-64, 6-3 | 
			1.56 | 
			2.36 | 
		
		
			|   Australian Open | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 13.01. | 
			  | 
			Paul T. - O'Connell C. | 
			1R | 
			6-2, 3-6, 6-1, 65-7, 7-5 | 
			1.17 | 
			5.11 | 
		
		
			|   Adelaide | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 08.01. | 
			  | 
			Kecmanovic M. - O'Connell C. | 
			R16 | 
			7-61, 6-2 | 
			1.84 | 
			1.95 | 
		
		
			| 06.01. | 
			  | 
			O'Connell C. - Rinderknech A. | 
			1R | 
			7-5, 7-65 | 
			1.61 | 
			2.31 | 
		
		
			|   Brisbane | 
			Round | 
			Result | 
			H | 
			A | 
		
		
			| 30.12. | 
			  | 
			Michelsen A. - O'Connell C. | 
			1R | 
			6-4, 4-6, 7-610 | 
			1.44 | 
			2.78 |