U.S. Pro Indoor
|Defunct tennis tournament|
|Event name||Philadelphia (1968–98)|
|Tour||ATP Tour (1990-98)
Grand Prix Tour (1979–89)
GP Championship Series (1970–86)
WCT circuit (1968–78)
United States (1968–98)
|Surface||Hard (i) (1993/97–98)
Carpet (i) (1968–92/94–96)
The U.S. Pro Indoor (mainly known as such during its run, but also as the U.S. Professional Indoor, the Ebel U.S. Pro Indoor, the Comcast U.S. Indoor, and the Advanta Championships) is a defunct professional tennis tournament played on indoor carpet courts, and indoor hard courts. It was part of the World Championship Tennis (WCT) circuit, between 1970 and 1986 it was a major ranking tournament of the Grand Prix Super Series after which it became a ATP Championship Series (1990–99), then a ATP International Series Gold tournament of the Association of Tennis Professionals (ATP) Tour. It was held annually first at the Spectrum, and then at the CoreStates Center, Philadelphia, United States, from 1968 to 1998. It was originally named the Philadelphia Indoor Open Tournament prior to the open era.
The United States Professional Indoor tennis championships were first created in Philadelphia, United States, in 1968, as part of the newly created WCT circuit, rival of the National Tennis League (NTL). As the first event of the season, the Philadelphia U.S. Professional Indoor attracted all WCT stars at the Philadelphia Spectrum at each of its yearly editions, with Rod Laver, John Newcombe or Marty Riessen winning the event in the early 1970s. After the WCT absorbed the NTL in 1970, the tournament continued to exist within the WCT tour until 1979, when the event officially became part of the Grand Prix Tour, precursor of the current ATP Tour.
As part of the Grand Prix's top tier tournaments until 1986, the Philadelphia event known as the U.S. Pro Indoor since 1973, saw American players dominating the fields in the 1970s and 1980s, with Tim Mayotte reaching four finals, World No. 1s Jimmy Connors and John McEnroe six finals each, and Czechoslovak Ivan Lendl three. In 1985, Swiss watch company Ebel S.A. started its six-year sponsorship of the event, the tournament becoming until 1990 the Ebel U.S. Pro Indoor. The event entered the new ATP circuit in 1990 as part of the Championship Series, to see eighteen-year-old, and future US Open champion Pete Sampras win his first career title against Andrés Gómez.
In 1991, the event lost Ebel's sponsorship, and went back to being the U.S. Pro Indoor for two editions, before Comcast became the sponsor of the event in 1992, effectively saving it from being discontinued. In the following years, the Comcast U.S. Indoor's prize money was reduced to less than a million dollars, preventing the creation of attractive line ups, and gaining the nickname "Comatose U.S. Indoor". In 1997, Advanta, already the sponsor of the 1971-created women's tournament of Philadelphia, the Advanta Championships, since 1995, took upon the sponsorship of the men's event, which also became the Advanta Championships. Pete Sampras won his third and fourth Philadelphia titles in the last two editions of the event, now taking place on indoor hard courts at the CoreStates Center, before it was definitely discontinued in 1998.
- Most titles: Rod Laver (4 titles), Jimmy Connors (4 titles), John McEnroe (4 titles) Pete Sampras (4 titles)
- Most consecutive titles: John McEnroe (4, 1982-'85)
- Most finals: Jimmy Connors (6 finals), John McEnroe (6 finals)
- Most consecutive finals: Jimmy Connors (5, 1976-'80)
- Tuller, David (1987-06-07). "What's New In The Tennis Business". The New York Times. Retrieved 2008-09-23.
- Bill Fleischman (January 27, 1986). "U.S. Pro Indoor Has Come In From The Cold". Philly.com.
- Macnow, Glen (1991-02-12). "Hard Times For Pro Indoor Title Sponsor Missing For First Time In Years". Philadelphia Inquirer. Retrieved 2008-09-23.
- Jensen, Mike (1991-11-08). "New Sponsorship Saves Spectrum Tournament". Philadelphia Inquirer. Retrieved 2008-09-23.
- Fleishman, Bill (1997-02-21). "1996 Finalist Wooruff To Skip Advanta". Philadelphia Daily News. Retrieved 2008-09-23.