Question: Are Sergio Casal and Victoria Azarenka both tennis players?

Context articles: Mark Gurr
1988 US Open – Men's Doubles
2009 Sony Ericsson Open – Women's Singles
1991 Athens Open – Doubles
Victoria Azarenka
Sergio Casal
Victoria Azarenka career statistics
2007 Tennis Channel Open and the Mirage Cup
1991 ATP German Open – Doubles
1990 ATP Tour World Championships – Doubles

Mark Gurr (born February 18, 1966) is a retired tennis player from Zimbabwe, who represented his native country as a qualifier at the 1988 Summer Olympics in Seoul, South Korea.
 There he lost in the first round of the men's singles competition to Spain's Sergio Casal.
 He lost in the second round of the men's doubles competition to Sweden's eventual bronze medalists Anders Järryd and Stefan Edberg, while partnering Philip Tuckniss.
The Men's Doubles tournament at the 1988 US Open was held from August 29 to September 11, 1988, on the outdoor hard courts at the USTA National Tennis Center in New York City, United States.
 Sergio Casal and Emilio Sánchez won the title, defeating Rick Leach and Jim Pugh by walkover in the final.
The 2009 Sony Ericsson Open – Women's Singles was the women's singles event of the 2009 Sony Ericsson Open, a WTA Premier Mandatory tennis tournament held in Key Biscayne, Florida in late March and early April.
 World No. 1 Serena Williams was the defending champion and attempting to win a record sixth title at the tournament, but she lost in the final to Victoria Azarenka, 6–3, 6–1.
 Azarenka won her third WTA singles title and first at the Premier or above level.
Sergio Casal and Javier Sánchez were the defending champions, but Casal did not participate this year.
 Sánchez partnered Goran Prpić, losing in the first round.
Victória Fyódorovna Azárenka (Belarusian: Вікторыя Фёдараўна Азаранка ; Russian: Виктория Фёдоровна Азаренко; born 31 July 1989) is a Belarusian professional tennis player.
 She is a former world No. 1.
Sergio Casal Martínez (born 8 September 1962) is a former professional tennis player from Spain.
 During his career, he won three Grand Slam doubles titles, as well as the men's doubles Silver Medal at the 1988 Summer Olympics.
This is a list of the main career statistics of Belarusian professional tennis player, Victoria Azarenka.
 To date, Azarenka has won twenty WTA singles titles including two grand slam singles titles, six WTA Premier Mandatory singles titles and three WTA Premier 5 singles titles.
 She was also the runner-up at the 2011 WTA Tour Championships, 2012 US Open and 2013 US Open.
 Among other achievements, Azarenka was the bronze medalist in women's singles and Gold medalist in mixed doubles with her compatriot, Max Mirnyi at the 2012 London Olympics.
The 2007 Tennis Channel Open was a tennis event on the 2007 ATP Tour.
 Lleyton Hewitt, who was the 2006 runner-up, was the singles champion, while Bob and Mike Bryan were the doubles champions.
 The event was held in Las Vegas, Nevada at the Darling Tennis Center.
 It was the twentieth Tennis Channel Open, but just the second to be held in Las Vegas.
 The ITF women's competition was won by Caroline Wozniacki in singles and by Victoria Azarenka and Tatiana Poutchek for doubles.
The 1991 German Open was a tennis tournament played on outdoor clay courts and was part of the ATP Super 9 of the 1991 ATP Tour.
 It took place at the Rothenbaum Tennis Center in Hamburg, Germany, from May 6 through May 13, 1991.
 Sergio Casal and Emilio Sánchez won in the final against Cássio Motta and Danie Visser, 7–6, 7–6.
The 1990 ATP Tour World Championships was a doubles event held in Gold Coast, Australia between November 19 and November 25, 1990.
 Guy Forget and Jakob Hlasek won the doubles title at the 1990 ATP Tour World Championships tennis tournament, defeating Sergio Casal and Emilio Sánchez in the final 6–4, 7–6, 5–7, 6–4.