Both players had 11 aces in a closely contested match where Berdych saved three break points. The fourth-seeded Czech broke the Romanian qualifier's serve once.
In other first-round matches, Frenchman Pierre-Hugues Herbert beat Spaniard Feliciano Lopez 7-6 (5), 7-6 (5); Dutchman Robin Haase downed Germany's Florian Mayer 7-5, 7-6 (3), and Russian qualifier Evgeny Donskoy won against Spaniard Marcel Granollers 6-4, 6-4.
Denis Istomin gained revenge on British No. 4 Aljaz Bedene to reach the second round. Istomin had lost to Bedene in the second round of qualifying but, having been given a place in the main draw as a lucky loser, he turned the tables to advance with a 6-3, 7-6 (3) win.