ATP Sydney 01/11 01:20 25 Federico Delbonis v Albert Ramos-Vinolas Cancelled
ATP Cup 01/04 23:00 1 [117] Kamil Majchrzak v Federico Delbonis [44] 6-3,7-6
ATP Cup 01/03 06:30 1 [399] Michail Pervolarakis v Federico Delbonis [44] 6-7,1-6
ATP Cup 12/31 23:00 1 Federico Delbonis v Aleksandre Metreveli 6-1,6-2
ATP Paris 11/01 13:05 24 [13] Cameron Norrie v Federico Delbonis [43] 6-2,6-1
ATP St Petersburg 10/26 11:35 25 [41] Federico Delbonis v Pablo Andujar [92] 2-6,6-7
ATP Antwerp 10/18 14:30 25 [40] Federico Delbonis v Arthur Rinderknech [65] 4-6,4-6
ATP Indian Wells 10/08 18:00 23 [44] Federico Delbonis v Yoshihito Nishioka [75] 3-6,6-3,6-7
ATP San Diego 09/27 20:25 25 [24] Aslan Karatsev v Federico Delbonis [44] 6-1,7-5
US Open 08/31 18:30 23 [47] Federico Delbonis v Denis Shapovalov [10] 2-6,2-6,3-6
ATP Winston-Salem 08/24 23:40 25 [65] Marcos Giron v Federico Delbonis [47] 6-3,6-4
ATP Cincinnati 08/16 17:15 24 [15] Jannik Sinner v Federico Delbonis [48] 6-2,7-5
ATP Kitzbuhel 07/27 09:00 25 [91] Arthur Rinderknech v Federico Delbonis [46] 6-2,6-4
ATP Gstaad 07/21 10:50 26 [46] Federico Delbonis v Hugo Gaston [155] 0-6,7-6,6-7
ATP Gstaad 07/20 13:00 25 Federico Delbonis v Leandro Riedi 6-3,6-3
ATP Hamburg 07/17 13:30 28 [48] Federico Delbonis v Pablo Carreno-Busta [13] 6-7,3-6
ATP Hamburg 07/16 16:10 27 [51] Benoit Paire v Federico Delbonis [48] 6-4,6-7,4-6
ATP Hamburg 07/15 15:50 26 [48] Federico Delbonis v Albert Ramos-Vinolas [41] 6-3,7-6
ATP Hamburg 07/13 10:30 25 [48] Federico Delbonis v Zhizhen Zhang [161] 6-1,5-7,6-4
Wimbledon 06/28 15:45 23 [47] Federico Delbonis v Andrey Rublev [7] 6-4,4-6,1-6,2-6
French Open 06/06 15:30 26 [46] Alejandro Davidovich Fokina v Federico Delbonis [51] 6-4,6-4,4-6,6-4
French Open 06/04 10:20 25 [29] Fabio Fognini v Federico Delbonis [51] 4-6,1-6,3-6
French Open 06/02 09:00 24 [51] Federico Delbonis v Pablo Andujar [68] 4-6,6-1,3-6,6-3,6-2
French Open 05/31 10:35 23 [89] Radu Albot v Federico Delbonis [51] 1-6,6-2,0-6,1-6
ATP Belgrade 05/28 14:15 28 [255] Alex Molcan v Federico Delbonis [52] 4-6,6-4,6-4
ATP Belgrade 05/27 15:30 27 Federico Delbonis v Roberto Carballes Baena Walkover
ATP Belgrade 05/26 10:00 26 [52] Federico Delbonis v Thiago Monteiro [79] 7-6,3-6,6-4
ATP Belgrade 05/24 13:10 25 [52] Federico Delbonis v Lukas Klein [254] 3-6,6-3,6-4
ATP Rome 05/14 08:00 27 [64] Federico Delbonis v Reilly Opelka [47] 5-7,6-7
ATP Rome 05/13 12:55 26 [21] Felix Auger Aliassime v Federico Delbonis [64] 6-7,1-6

Wikipedia - Federico Delbonis

Federico Delbonis (Spanish pronunciation: [feðeˈɾiko ðelˈβonis]; born 5 October 1990) is an Argentine former professional tennis player. He achieved a career-high ATP singles ranking of No. 33 on 9 May 2016. He also reached a career-high doubles ranking of No. 110 on 22 July 2019.

Delbonis was known for his unorthodox serve, an exaggerated trophy serve in which he would raise his racquet, toss the ball unusually high and follow through.