The Hopman Cup XXI corresponds to the 21st edition of the Hopman Cup tournament between nations in men's and women's tennis. The tournament was held from 3 January through 9 January 2009 at the Burswood Entertainment Complex in Perth, Western Australia.
The Hopman Cup XXIII corresponds to the 23rd edition of the Hopman Cup tournament between nations in men's and women's tennis. The tournament commenced on 1 January 2011 at the Burswood Dome in Perth, Western Australia. The tournament was contested on hard courts.
Kazakhstan is a nation that has competed at two Hopman Cup tournaments and first competed in the 22nd Hopman Cup in 2010. Its best result to date is finishing second in their group in 2010.
Serbia is a nation that has competed at three Hopman Cup tournaments since it gained its independence following the breakup of Yugoslavia in the early 1990s. It first competed in the 18th Hopman Cup in 2006. Serbia has reached the final on three occasions; the first time in 2008 where they lost to the United States, in 2011 where they had to retire before the final was played due to an abdominal injury sustained by Ana Ivanovic, and in 2013 when they lost to Spain.
Australia is a nation that has competed at each edition of the Hopman Cup tournament since the inaugural event in 1989. Australia won the title in 1999 and 2016, and finished as the runners up in 1989 and 2003.
Germany is a nation that has competed at fourteen Hopman Cup tournaments and first competed in the inaugural Hopman Cup in 1989. Germany reached the final for three consecutive years between 1993 and 1995, finishing as the runners-up in 1994 but winning the tournament on the other two occasions.
Belgium is a nation that has competed at eight Hopman Cup tournaments and first competed in the 12th Hopman Cup in 2000. Belgium has been the runner-up on one occasion, in 2011, when they finished second in their group but after Serbia's withdrawal from the final due to an abdominal injury sustained by Ana Ivanovic, they were promoted to face USA in the final.
Czechoslovakia is a nation that competed at four consecutive Hopman Cup tournaments and first competed in the inaugural Hopman Cup in 1989, winning the event. This was their only time winning the event, but they did finish as the runners-up in 1992.
The Czech Republic is a nation that has competed at the Hopman Cup tournament on ten occasions, first competing at the 5th Hopman Cup in 1993. They have won the title on two occasions: in 1994 and in 2012.
Slovakia is a nation that has competed at the Hopman Cup tournament on eight occasions, first competing at the 10th Hopman Cup in 1998. They have won the title three times: in 1998, 2005 and 2009.
Argentina is a nation that has competed at the Hopman Cup tournament on five occasions, the first being at the 7th annual staging in 1995. In 2005, Argentina were the tournament runners-up and this remains their best showing to date.
France is a nation that has competed at twenty five Hopman Cup tournaments and first competed in the inaugural Hopman Cup in 1989. Their best results to date came in 2014, when they defeated Poland in the final by two rubbers to one, and in 2017 when they defeated the United States in the final, also by two rubbers to one.
Taiwan is a nation that has competed at the Hopman Cup tournament on two occasions. The nation's first appearance came in 2008 when they qualified for the event by winning the second annual Asian Hopman Cup in 2007. They repeated this feat the following year by again winning the 2008 Asian Hopman Cup and going on to compete in the round robin stages of the main tournament in Australia. They also competed in the Asian Hopman Cup in 2006 and 2009, losing in the final in both years and thus missing out on a spot in the main event both times.
Russia is a nation that has competed at the Hopman Cup tournament on seven occasions, their first appearance coming at the 13th annual staging of the event in 2001. They have won the tournament on one occasion, in 2007, and were the runners up two years later in 2009.
Spain has competed at the Hopman Cup tournament on eighteen occasions, their first appearance coming at the 2nd annual staging of the event in 1990. They have won the tournament four times: in 1990, 2002, 2010 and 2013. They were also runners-up on two occasions: in 1993 and 2007.
Romania is a nation that has competed at the Hopman Cup tennis tournament on three occasions, the first of which was at the 9th annual staging of the tournament in 1997, when they finished fourth in their group. They replicated this result in 2010 and to date they have not yet bettered it.
Switzerland is a nation that has competed at the Hopman Cup tournament on thirteen occasions, the first being at the third annual staging in 1991. It won the tournament in 1992, 2001, 2018, and 2019, and was also runners-up in 1996, and 2023.
Bulgaria is a nation that has appeared at Hopman Cup on one occasion, in 2012.
Denmark is a nation that has appeared at Hopman Cup in 2012.
Sweden is a nation that has competed at the Hopman Cup tournament on eight occasions, their first appearance coming at the 1st annual staging of the event in 1989. They have been runner-up in one tournament in 1999.
