Question: Are Petra Kvitová and Oliver Marach of the same nationality?

Context articles: Oliver Marach
2013 Dubai Tennis Championships – Women's Singles
Petra Kvitová
Petra Kvitová career statistics
2017 Aircel Chennai Open – Doubles
2008 BCR Open Romania – Doubles
2011 BMW Open – Doubles
2010 Serbia Open – Doubles
2014 Geneva Open Challenger – Doubles
2011 Aegon International – Women's Singles

Oliver Marach (born 16 July 1980) is an Austrian professional tennis player.
 His highest ATP singles ranking is world No. 82, which he reached on August 7, 2005.
 His career high in doubles is world No. 8, set on October 18, 2010.
Agnieszka Radwańska was the defending champion, but lost in the quarterfinals to Petra Kvitová.
 Kvitová went on to win the title, defeating Sara Errani in the final, 6–2, 1–6, 6–1.
Petra Kvitová (] ; born 8 March 1990) is a Czech professional tennis player.
 Known for her powerful left-handed groundstrokes and variety, Kvitová turned professional in 2006 and has won 20 career singles titles, including two Grand Slam titles at Wimbledon.
 She is also an Olympic medalist, capturing the bronze medal at the 2016 Rio Olympics.
 She reached her career-high ranking of world no. 2 on 31 October 2011 and as of 18 September 2017, is ranked world no. 14 by the Women's Tennis Association (WTA).
 As such, Kvitová is the current second highest-ranked Czech and the second highest-ranked left-handed player in the WTA behind Karolína Plíšková and Germany's Angelique Kerber, respectively.
This is a list of the main career statistics of Czech professional tennis player Petra Kvitová.
 To date, Kvitová has won 20 singles titles including two Grand Slam singles titles at the Wimbledon Championships, one WTA Tour Championships singles title, two WTA Premier Mandatory singles titles and four WTA Premier 5 singles titles.
 She was also the bronze medallist at the 2016 Rio Olympics, a semifinalist at the 2010 Wimbledon Championships, 2012 Australian Open and 2012 French Open and a quarterfinalist at the 2011 Australian Open, 2012 Wimbledon Championships, 2013 Wimbledon Championships, 2015 US Open and 2017 US Open.
 Kvitová reached her career-high ranking of world no. 2 on 31 October 2011.
Oliver Marach and Fabrice Martin are the defending champions, but Marach chose not to participate this year and Martin chose to compete in Doha instead.
Oliver Marach and Michal Mertiňák were the defending champions, but Marach chose not to participate, and only Mertinak competed that year.
Oliver Marach and Santiago Ventura were the defending champions, but decided not to participate.
 Marach competed in the Serbia Open instead.
Łukasz Kubot and Oliver Marach were the defenders of title, but Kubot chose not to compete this year and Marach chose to play in Munich instead.
Oliver Marach and Florin Mergea were the defending champions.
 Mergea did not participate this year, Marach partnered fellow Austrian Philipp Oswald.
Ekaterina Makarova was the defending champion, but lost to Petra Kvitová in the second round.
 Kvitová eventually lost the final 1–6, 6–4, 5–7 to Frenchwoman Marion Bartoli.
 It was Bartoli's first title of the year and sixth of her career.
 It was her second Premier-level career title and first on grass courts.