In the 2009 French Open, he entered the Boys' Singles as an unseeded player. He defeated 9 seed
Facundo Argüello in the first round. He then won against
Pablo Carreño Busta and
Federico Gaio to reach the quarter-finals, where he defeated
Richard Becker in straight sets. In the semi-finals, he defeated
Henri Laaksonen to reach his first ever junior Grand Slam final. He defeated French player and 11 seed
Gianni Mina 6–1, 3–6, 6–3[1] for his first ever junior Grand Slam title[citation needed].
In the junior
2009 Wimbledon Championships, Berta lost in the third round to American Alexander Domijan 3–6, 3–6.
ATP
He was granted a wildcard into the
2009 Ordina Open, which was his
ATP tournament debut. He lost to Belgian qualifier
Dick Norman in the first round, 3–6, 3–6.[2] He also received a wildcard into the
2009 Swedish Open, where he lost to
Björn Phau in the first round 3–6, 2–6.