| 维琴察挑战赛 | 06/01 10:25 | 27 | [253] 曾俊欣 v 默克尔•德林 [222] | 6-4,6-3 | |
| 维琴察挑战赛 | 05/31 13:15 | 26 | [222] 默克尔•德林 v 斯特凡诺•特拉瓦里 [202] | 6-1,6-2 | |
| 维琴察挑战赛 | 05/29 11:40 | 25 | [222] 默克尔•德林 v 埃尔吉•基尔金 [260] | 6-3,6-1 | |
| 法国公开赛 | 05/21 17:05 | 14 | [84] 蒂亚戈•莫拉蒙泰罗 v 默克尔•德林 [222] | 6-4,6-1 | |
| 突尼斯挑战赛 | 05/16 10:00 | 27 | [222] 默克尔•德林 v 奥里奥尔•罗卡•巴塔拉 [212] | 6-4,0-6,4-6 | |
| 突尼斯挑战赛 | 05/15 09:00 | 26 | [222] 默克尔•德林 v 米切尔•克鲁格 [252] | 6-3,6-4 | |
| 突尼斯挑战赛 | 05/13 12:35 | 25 | [186] 斯特凡诺•特拉瓦里 v 默克尔•德林 [222] | 7-5,3-6,1-6 | |
| 弗兰卡维拉挑战赛 | 05/06 13:10 | 25 | [222] 默克尔•德林 v 安德烈•佩莱格里诺 [164] | 4-6,7-5,3-6 | |
| 阿雷格里港挑战赛 | 05/01 17:50 | 25 | [434] 卢西安诺•伊曼纽尔•安布罗吉 v 默克尔•德林 [222] | 7-6,7-5 | |
| 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 |
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.