The tournament runs through 23 July. Some of the players are Fabio Fognini, who won the tournament last year, Monfils, Coric, Gilles Simon, Paolo Lorenzi, and Philipp Kohlschreiber.
The expected start of the matches is 5 p.m. and 8 p.m. The exact schedule is prepared by the ATP Supervisor.
The organisers of this 250-level ATP men's tennis tournament said on Friday that everything was ready for the event.
The tournament is played on red clay courts. Carlos Moya has won the tournament a record five times. In 2012, Marin Cilic became the first homegrown champion since the tournament's inaugural edition in 1990.