The Qatar Airways Tournament of Champions Sofia is the Season-Ending Championships of the WTA's International Series that features top WTA players and next-generation champions.

Six players who have captured at least one International event during the year and who are not participating in singles at the season-ending WTA Championships qualify, plus two wildcards.

Debuting in 2009 in Bali, the event moved to Sofia's Armeets Arena for the 2012-2014 editions. Winners are Aravane Rezai in 2009, Ana Ivanovic in 2010 and 2011 and Nadia Petrova in 2012.

Tennis is increasingly popular in Sofia, which is Bulgaria's capital and largest city. Many of the country's major universities, cultural institutions and businesses are concentrated in Sofia.