| 墨西哥城挑战赛 | 04/04 18:00 | 26 | [226] 默克尔•德林 v 奥利弗•克劳福德 [203] | 2-6,4-6 | |
| 墨西哥城挑战赛 | 04/02 21:40 | 25 | [356] Gerard Campana Lee v 默克尔•德林 [226] | 6-7,6-3,5-7 | |
| 圣路易波托西挑战赛 | 03/28 18:00 | 26 | [229] 默克尔•德林 v 马蒂亚斯•索托 [170] | 5-7,4-6 | |
| 圣路易波托西挑战赛 | 03/26 16:00 | 25 | [167] 马利克•波尔曼斯 v 默克尔•德林 [229] | 3-6,4-6 | |
| 梅里达挑战赛 | 03/22 23:00 | 28 | [229] 默克尔•德林 v 胡安•巴勃罗•菲科维奇 [237] | 6-3,3-6,4-6 | |
| 梅里达挑战赛 | 03/21 22:00 | 27 | [432] 罗伯托•西德•苏韦尔维 v 默克尔•德林 [229] | 2-6,2-6 | |
| 梅里达挑战赛 | 03/20 20:00 | 26 | 亚历克斯•埃尔南德斯 v 默克尔•德林 | 1-6,6-3,3-6 | |
| 梅里达挑战赛 | 03/19 00:00 | 25 | 奥赞•巴里斯 v 默克尔•德林 | 3-6,2-6 | |
| 圣地亚哥挑战赛 | 03/12 17:10 | 25 | [233] 弗朗西斯科•帕萨罗 v 默克尔•德林 [247] | 6-0,6-4 | |
| 圣克鲁斯挑战赛 | 03/10 16:30 | 29 | [127] 卡米洛•乌戈•卡拉贝利 v 默克尔•德林 [247] | 6-4,6-2 | |
| 圣克鲁斯挑战赛 | 03/09 21:50 | 28 | [247] 默克尔•德林 v 伦佐•奥里诺 [286] | 弃权 | |
| 圣克鲁斯挑战赛 | 03/09 15:35 | 27 | [159] 罗曼•安德烈斯•布鲁查加 v 默克尔•德林 [247] | 2-6,6-2,4-6 |
Murkel Alejandro Dellien Velasco (born 16 September 1997) is a Bolivian tennis player. He has a career-high ATP singles ranking of No. 263, achieved on 30 October 2023. He is the current No. 2 Bolivian tennis player. He also has a career-high ATP doubles ranking of No. 186 achieved on 29 January 2024.
Dellien played college tennis at Wichita State.
Dellien represents Bolivia at the Davis Cup, where he has a W/L record of 1–0.
In 2021 he defeated Zizou Bergs in his first Davis Cup rubber.