Question: When is the tennis tournament held annually in which Bernard Tomic reached the fourth round in 2012, 2015 and 2016?
Context: The Irving Tennis Classic (previously held as Dallas Tennis Classic) is a tennis tournament held annually in Irving, Texas, United States since 2012.  The event is one of main tournaments of the ATP Challenger Tour calendar and is played on outdoor hard courts. The 1877 Wimbledon Championship was a men's tennis tournament held at the All England Croquet and Lawn Tennis Club (AEC & LTC) in Wimbledon, London.  It was the world's first official lawn tennis tournament, and was later recognised as the first Grand Slam tournament or "Major".  The AEC & LTC had been founded in July 1868, as the All England Croquet Club; lawn tennis was introduced in February 1875 to compensate for the waning interest in croquet.  In June 1877 the club decided to organise a tennis tournament to pay for the repair of its pony roller, needed to maintain the lawns.  A set of rules was drawn up for the tournament, derived from the first standardised rules of tennis issued by the Marylebone Cricket Club in May 1875. This is a list of the main career statistics of professional Australian tennis player, Bernard Tomic.  To date, Tomic has reached one grand slam quarterfinal at the 2011 Wimbledon Championships and won three ATP singles titles including two consecutive titles at the Claro Open Colombia from 2014–2015.  He was also a quarterfinalist at the 2015 BNP Paribas Open and 2015 Shanghai Rolex Masters and part of the team which reached the semifinals of the 2015 Davis Cup.  He also reached the fourth round of the Australian Open in 2012, 2015 and 2016.  Tomic achieved a career high singles ranking of World No. 17 on 11 January 2016. The Australian Open is a major tennis tournament held annually over the last fortnight of January in Melbourne, Australia.  First held in 1905, the tournament is chronologically the first of the four Grand Slam tennis events of the year – the other three being the French Open, Wimbledon and the US Open.  It features men's and women's singles; men's, women's and mixed doubles and junior's championships; as well as wheelchair, legends and exhibition events.  Prior to 1988 the tournament had been played on grass courts, but since then two types of hardcourt surfaces have been used at Melbourne Park – green coloured Rebound Ace up to 2007 and, afterwards, blue Plexicushion. Bernard Tomic (Croatian: "Tomić" ; born 21 October 1992) is an Australian professional tennis player who has a career high ranking of 17.  As a junior, Tomic enjoyed a successful career in which he won three Orange Bowl titles and two junior grand slam singles titles, the 2008 Australian Open and 2009 US Open.  Highlights of Tomic's career include winning the 2013 Apia International Sydney, 2014 Claro Open Colombia and the 2015 Claro Open Colombia.  Other highlights include a final appearance at the 2016 Acapulco Telcel and a quarterfinal appearance at the 2011 Wimbledon Championships as well as at the 2015 BNP Paribas Open and the 2015 Shanghai Masters. The Brasil Open is a tennis tournament held annually in São Paulo, Brazil.  A part of the ATP World Tour 250 series, it is one of the main events in the Brazilian tennis calendar.  Since 2004, it has been a part of the South American clay court circuit but was held on hard courts prior to 2004.  Nicolás Almagro and Pablo Cuevas hold the record for most titles at this tournament. The United States Disc Golf Championship is a disc golf tournament held at the Winthrop Gold Course, on the campus of Winthrop University in Rock Hill, South Carolina.  The professional event has been held annually since 1999.  Along with the PDGA World Championships, it is one of the most prestigious major tournaments in disc golf.  The primary sponsor for the event over the past decade has been Innova, a disc manufacturer.  Ken Climo currently holds a record five US Disc Golf Championships.  The most recent champion (2016) is Jeremy "Big Jerm" Koling, who was leading the tournament after the third round.  He was declared the winner when the fourth round was canceled due to inclement weather produced by Hurricane Matthew. The Vietnam Open is a tennis tournament held annually in Ho Chi Minh City, Vietnam, since 2015.  The event is part of the ATP Challenger Tour and is played on outdoor hard courts. For sponsorship reasons, the tournament was called Vietnam Open presented by Bia Saigon Special in 2015 and Vietnam Open presented by Vietravel in 2016.  The tournament is managed by Sports Marketing Company STREAM Vietnam and directed by International Sports Agent Mr Longy Le Hoang. The River Oaks International Tennis Tournament, also known as the River Oaks Invitational Tennis Tournament, was a men's tennis tournament held in early spring from 1931 until 2007 at the River Oaks Country Club, Houston, Texas, USA.  The tournament was the oldest in the country to still be played at its original site, in the original stadium.  The tournament was founded by cotton broker Jack Norton.  From the very beginning, the River Oaks International was an invitational amateur tournament, and was not associated with the professional tennis associations.  From the start, the field was filled with a few stars and then local candidates filled out the rest of the field.  The inaugural edition in April 1931, which made a loss of $1,500, was won by 19-year-old Ellsworth Vines.  The tournament was not held during the World War II years 1942–1945. The İstanbul Cup is a WTA tennis tournament held in Istanbul, Turkey, organised for professional female tennis players.  It is classified as an International-level tournament on the WTA Tour.  Held annually since 2005 in the month of May, it was played on outdoor clay courts until 2009, after which the organisers decided to switch the surface to outdoor hard courts.  It was not held in between 2011–2013, due to the WTA Tour Championships moving to Istanbul for those years.  It resumed for the 2014 WTA season.
Answer: last fortnight of January