Philippines Open International Championships

The Philippines Open International Championships and later known as PHILTA International Championships or simply the Philippines Open was an international men's and women's clay then later court tennis tournament founded in 1918 as the Philippine Championships . It was first organised by the Philippine Tennis Association (PhilTA) and first played at the Rizal Memorial Tennis Center, Manila, Philippines. This international tournament was part of the ILTF World Circuit until 1978 when it was discontinued.

History
In 1906 the Manila (Philippine Islands) Lawn Tennis Association was founded. In 1913 it became the Philippine Lawn Tennis Association formally incorporated in 1920. In 1936 it joined the International Lawn Tennis Federation. In 1920 PhilLTA organised the first International Championships of the Philippines.

In 1907 the Championship of the Orient tournament was held in Manila until 1909 and played at the Philippine Amateur Athletic Association tennis court grounds before it was discontinued for one year. In 1911 it was revived until 1917. The Philippines Championships tournament had its origins in the Oriental Tennis Championships event, an early ancestor event of the Asian Championships.

In 1918 the Philippines Championships were held for the first time, and were played at the Manila Tennis Club. In 1920 that tournament became a fully open event called the Philippines Open Championships. From 1918 until 1924 it was an event for men only. In 1925 a women's event was established. In 1934 the Manila Carnival Grounds was renamed and this tournament was then played at the newly built Rizal Memorial Tennis Stadium on clay courts. In 1940 the Rizal Memorial Tennis Stadium was renamed as the Rizal Memorial Coliseum, that now included an indoor stadium.

In 1959 two editions of the men's event were held one in later January and the other in early December. In 1961 two editions of the men's event were played again one in the first week of February on outdoor clay courts, the second during the mid two weeks of month on outdoor hard courts. In 1972 this tournament usually held in February was moved to November that year. For the years 1973 to 1978 it was also valid as the Manila International Championships (f.1968) or Manila Open also played in November. The tournament was discontinued in 1978.

In 1981 PHILTA staged a new tournament called the Philippine Classic that was won by Ramesh Krishnan. After a period of 35 years international tennis returned to the Rizal Memorial Tennis Center in the form of the Manila Challenger (also known as the Philippine Open), a clay court event that was won by Mikhail Youzhny.

This tournament went through a number of different denominations see tournament names below.

Event names

 * Philippines Championships (1918–1920).
 * International Championships of the Philippines (1920–1941).
 * Philippines International Championships (1950–1972).
 * Philippines Championships (1973–1974).
 * Philta International Championships (1975).
 * Philippine Open (1976).
 * Philta International Championships (1975, 1977–1978).

Men's singles
Notes: ''In 1959 two editions of the men's event were held one in January denoted as (*) the other in December denoted as (**). In 1961 two editions of the men's were held one in early February denoted as (*) the other in mid February denoted as (**).''

(incomplete roll)

Women's singles
(incomplete roll)

Other tournaments

 * Manila Challenger (an ATP Challenger tournament held in Manila in 2016)
 * Manila International Championships (an international tournament founded in 1968 and played in November through till 1978, and again in 1981.)
 * Manila Invitational (a 4 four man exhibition tournament held in 1978 and won by Björn Borg).
 * Manila Metropolitan Championships (founded in 1930 held in Manila until 1972, revived by PHILTA in 2023 as the Metro Manila Open).
 * Philippine Championships (closed) officially the Philippine National Championships (founded in 1920 ran till 1971).
 * Philippine Indoor Championships (founded in 1940 ran till 1950).