Campionati Internazionali di Sicilia

The Campionati Internazionali di Sicilia or International Championships of Sicily, also known as the Palermo Open, was a combined men's and women's clay court tennis tournament founded in 1935 and played annually at the Circolo Tennis Palermo in Palermo in Italy. In 1971 the women's event was discontinued leaving just the men's event that ran until 2006.

History
The International Championships of Sicily were established in 1935 as a combined tournament for men and women. In 1955 the Campionati Internazionali di Sicilia were disputed in Messina and won among the men Nicola Pietrangeli who beat in final Fausto Gardini in five sets, and in female tournament Silvana Lazzarino that won in final against Lea Pericoli. The tournament continued under a joint format until 1971 when the women's event was discontinued. In 1988 a new international tournament for women held in Palermo was reestablished known as the Internazionali Femminili di Palermo.

The tournament was a part of the ATP Tour schedule from 1990 to 2006. The event was part of the ATP World Series from 1990 until 1999 and part of its successor, the ATP International Series, from 2000 until its final edition in 2006. That year the ATP bought back the tournament sanction. In 2009 a new successor tournament to this event was established called the Sicilia Classic.