The If Stockholm Open is a tennis event on the ATP Tour held in Stockholm, Sweden in the end of October or beginning of November each year. The organizer of the tournament is The Royal Lawn Tennis Club of Stockholm.

The first Stockholm Open was held in 1969 and it has been played each year ever since. The tournament is played on indoor hard court and features both men's singles and doubles tournament. In 1975, 1979, and 1980, a short-lived women's competition was held, which was played on carpet.

Stockholm Open was first held in 1969 in Kungliga tennishallen in Stockholm. It has been held there ever since except for the years 1989 to 1994 when it was held in the Stockholm Globe Arena. Between 1970 and 1989 it was a major ranking tournament of the Grand Prix Tennis Tour as part of the Grand Prix Championship Series (except from 1981 to 1983, when it was briefly downgraded).

From 1990 until 1994 it was an ATP Championship Series Single Week event. Since 1995, the tournament has been downgraded from Super 9 status offering $1.72 million in prize money to ATP World Tour 250 series level with €600,000 prize money.

Stockholm (Swedish pronunciation: [ˈstɔkːˈhɔlm, ˈstɔkːˈɔlm, ˈstɔkːɔlm]( listen to the second one)) is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 864,324 in the municipality (2010), 1.4 million in the urban area (2010), and around 2.1 million in the 6,519 km² (2,517.00 sq mi) metropolitan area (2010). As of 2010, the Stockholm metropolitan area is home to approximately 22% of Sweden's population.

Founded no later than c. 1250, possibly as early as 1187, Stockholm has long been one of Sweden's cultural, media, political, and economic centres. Its strategic location on 14 islands on the south-central east coast of Sweden at the mouth of Lake Mälaren, by the Stockholm archipelago, has been historically important. Stockholm has been nominated by GaWC as a global city, with a ranking of Alpha-. In The 2008 Global Cities Index, Stockholm ranked 24th in the world, 10th in Europe, and first in Scandinavia. Stockholm is known for its beauty, its buildings and architecture, its abundant clean and open water, and its many parks. It is sometimes referred to as Venice of the North.

Roger Federer (German pronunciation: [ˈfeːdəʁɐ]) (born 8 August 1981) is a Swiss professional tennis player who held the ATP No. 1 position for a record 237 consecutive weeks from 2 February 2004 to 18 August 2008. Federer has occupied the #1 ranking for 285 overall weeks, one week short of the record 286 weeks held by Pete Sampras. As of 28 May 2012, he is ranked World No. 3. Federer has won a men's record 16 Grand Slam singles titles. He is one of seven male players to capture the career Grand Slam and one of three (with Andre Agassi and Rafael Nadal) to do so on three different surfaces (clay, grass, and hard courts). He is the only male player in tennis history to have reached the title match of each Grand Slam tournament at least five times and also the final at each of the nine ATP Masters 1000 Tournaments. Many sports analysts, tennis critics, and former and current players consider Federer to be the greatest tennis player of all time.

Federer has appeared in an unprecedented 23 career Grand Slam tournament finals, including a men's record ten in a row, and appeared in 18 of 19 finals from the 2005 Wimbledon Championships through the 2010 Australian Open, the lone exception being the 2008 Australian Open. He holds the record of reaching the semifinals or better of 23 consecutive Grand Slam tournaments over five and a half years, from the 2004 Wimbledon Championships through the 2010 Australian Open. At the 2012 Australian Open, he reached a record 31st consecutive Grand Slam quarterfinal. During the course of his run at the 2012 French Open in Roland Garros, Federer eclipsed Jimmy Connors long standing record of 233 match wins in Grand Slam tournaments when he defeated Adrian Ungur in a second round match.

Ernests Gulbis (pronounced [ˈærnəsts ˈɡulbis], born August 30, 1988) is a Latvian professional tennis player. In 2008, Gulbis won his first ATP Tour doubles title at the U.S. Men's Clay Court Championships, teaming with Rainer Schüttler, and in 2010 won his first ATP Tour singles title in the Delray Beach, defeating Ivo Karlović in the final. He won his second in July, 2011, by defeating Mardy Fish in the final of the 2011 Farmers Classic tournament, held in Los Angeles. His career highlights also include a 4th round appearance at the 2007 US Open and a quarterfinal appearance at the 2008 French Open, as well as several other ATP World Tour semifinal appearances.

Gulbis' professional training in tennis began at the age of 12, when he was enrolled at the Niki Pilić Tennis Academy in Croatia. Beginning after Wimbledon 2011, Gulbis is being coached by Guillermo Cañas. Previously, he was coached by Hernán Gumy (who before that was Marat Safin's coach), but their partnership ended due to Gumy's schedule; during that time, Darren Cahill served as Gulbis' consultant for several tournaments. Before Gumy, Ernests was coached by Karl Heinz Wetter and subsequently Nikola Pilić, the former professional Croatian tennis player and Croatian and German Davis Cup captain.

Juan Ignacio Chela , known as "El Flaco," (born August 30, 1979) is a professional male tennis player from Argentina. Like most Argentine players he is comfortable on Clay courts and owns all six of his career titles on the surface. He was born in Ciudad Evita, Provincia de Buenos Aires.

In February, he reached the quarterfinals in Salvador, defeating Flavio Saretta and David Ferrer, before falling to Agustin Calleri 3–6, 6–3, 3–6. He won in doubles at Viña del Mar, partnering Gaston Gaudio.

At Acapulco and Indian Wells, he reached the quarterfinals, but lost to Oscar Hernandez Perez and Roger Federer, respectively. In Acapulco, he also reached the final in doubles, partnering Nicolas Massu, but they lost to the Bryan brothers 2–6, 3–6.

In April, Chela won in Estoril against Marat Safin 6–7, 6–3, 6–3. He also won in doubles, partnering Gaston Gaudio.

He reached the quarterfinals of the French Open, where he lost to Tim Henman 2–6, 4–6, 4–6. In doubles, he reached the quarterfinals in Rome, where he and Guillermo Cañas lost to the Bryan brothers, and in Hamburg, where he also partnered with Cañas.