Question: When did the international tournament at Wimbledon begin?
About the article "Tennis", section "Grand Slam tournaments".

Candidate passages:
The 1911 Wimbledon Championships took place on the outdoor grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon, London, United Kingdom.
The tournament ran from 26 June until 8 July.
It was the 35th staging of the Wimbledon Championships, and the first Grand Slam tennis event of 1911.
The men's singles entry reached three figures, when 104 players entered the Challenge Round. 
  The Championships, Wimbledon, a lawn court tennis tournament, one of the four Grand Slam championships * The All England Lawn Tennis and Croquet Club, venue for the tournament * "Wimbledon" (film), a fictional film set around the championships  * Wimbledon Effect, nickname for the success of foreign financial firms in London, analogous to the success of foreign players in the championships  *Radio Wimbledon, the official radio station for the Wimbledon Tennis Championships  Wimbledon RFC, one of a number of rugby clubs based in Wimbledon  AFC Wimbledon, a professional football club set up by former fans of Wimbledon F.C.
in protest at the move to Milton Keynes  AFC Wimbledon Ladies, a ladies football club, with affiliation to AFC Wimbledon  Wimbledon Dons, former speedway team  Wimbledon Stadium, a dog racing track located in Earlsfield in southwest London, England  Wimbledon Cup (disambiguation) – any of several competitions and their trophies  
2006 did not begin well for O'Donoghue; before heading into the qualifying draws for the DFS Classic, the Hastings Direct International and Wimbledon, she had accumulated a win-loss record of 3–15 in main draw ITF matches.
She lost in straight sets in the first round of the qualifying draws for both the DFS Classic and the Hastings Direct International and then reached the second round of qualifying for Wimbledon.
Following this, she reached her first ITF semifinal of the season in a $10,000 event in Frinton where she lost to Georgie Stoop.
In August she was the runner-up in another $10,000 ITF and a quarterfinalist in yet another.
She reached the quarterfinals of only one more ITF tournament before the end of the year and her season-ending ranking was world no.
336. 
The 2009 Wimbledon Championships took place on the outdoor grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon, London, from Monday 22 June through to Sunday 5 July 2009.
It was the 123rd staging of the Wimbledon Championships, and the third Grand Slam tennis event of the year.
Rafael Nadal did not defend his title after withdrawing from the tournament due to knee tendinitis.
Roger Federer won his 6th Wimbledon title defeating rival Andy Roddick in the final in five sets.
Federer's victory marked his fifteenth Grand Slam title which broke the men's all-time record.
Venus Williams was unsuccessful in her title defence, being defeated in the final by her sister Serena, who won her first Wimbledon title since 2003. 
During Wimbledon in 1966, Jack Kramer was doing radio commentary for the BBC when Wimbledon's working chairman Herman David came to the broadcast booth and talked to Kramer and BBC tennis exec Bryan Cowgill to discuss the possibility of making the tournament "open" to both amateurs and pros.
The topic had been raised on and off for years.
In the summer of 1960 the International Lawn Tennis Federation (ILTF) had met in Paris and voted on open tennis, but the motion, which required 139 out of 209 votes to pass, got only 134 votes, 5 short.
By 1966 public interest in tennis had been at a long-sustained low.
Cowgill suggested a trial pro tournament at Wimbledon for the following year, and in late August, 1967, the tournament was held at Wimbledon with total prize money of US$ 35,000 for singles and US$ 10,000 for doubles, making it the largest prize-money event in tennis history at that time.
All matches were played on Centre Court.
The Wimbledon Pro tournament was deemed very successful with over 30,000 spectators attending the three days of play.
There was an 8 player draw for singles and a 16 player draw for doubles, all professionals.
Most of these players had won honours at Wimbledon in their amateur days but had forfeited the right to play there on turning professional.
The segregation of the two categories was soon to come to an end.
In December 1967, the Annual Meeting of the British Lawn Tennis Association (LTA) voted overwhelmingly to admit players of all categories for the 1968 Wimbledon Championships and other future tournaments in Britain.
Faced with a fait accompli the ILTF yielded and allowed each nation to determine its own legislation regarding amateur and professional players.