Question: What sport do both Horia Tecău and Jeļena Ostapenko play?

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2010 UNICEF Open – Men's Doubles: Wesley Moodie and Dick Norman were defending champions, but they lost in the semifinals against Robert Lindstedt and Horia Tecău. Lindstedt and Tecău won the final 1–6, 7–5, [10–7] against Lukáš Dlouhý and Leander Paes.

2010 Pilot Pen Tennis – Men's Doubles: Julian Knowle and Jürgen Melzer were the defending champions, but Melzer chose not to participate this year.As a result, Knowle partnered with Andy Ram, but they lost to Robert Lindstedt and Horia Tecău in the semifinals.  Lindstedt and Tecău went on to win the tournament, after defeating Rohan Bopanna and Aisam-ul-Haq Qureshi in the final 6–4, 7–5.

2017 Dubai Tennis Championships – Women's Doubles: Chuang Chia-jung and Darija Jurak were the defending champions, but chose not to participate together.  Chuang played alongside Zheng Saisai, but lost in the first round to Gabriela Dabrowski and Jeļena Ostapenko.  Jurak teamed up with Anastasia Rodionova, but lost in the second round to Dabrowski and Ostapenko.

Horia Tecău: Horia Tecău (] ; born January 19, 1985) is a Romanian tennis player currently ranked World No. 9 in doubles.  He turned pro in 2003 and reached the men's doubles finals of the 2010, 2011 and 2012 Wimbledon Championships with Robert Lindstedt before winning it in 2015 with Jean-Julien Rojer, with whom he also won the 2017 US Open.  Tecău also won the 2012 Australian Open mixed doubles title with Bethanie Mattek-Sands and the 2015 ATP World Tour Finals with Rojer.

2014 Australian Open – Mixed Doubles: Jarmila Gajdošová and Matthew Ebden were the defending champions, but they lost in the semifinals to Sania Mirza and Horia Tecău. <br> Kristina Mladenovic and Daniel Nestor won the title, defeating Mirza and Tecău in the final, 6–3, 6–2.

2009 Mamaia Challenger – Doubles: Florin Mergea and Horia Tecău were the defending champions.  Tecău didn't start this year.

2014 Topshelf Open – Men's Doubles: Max Mirnyi and Horia Tecău were the defending champions, but Mirnyi chose not to participate.  Tecău played alongside Jean-Julien Rojer and successfully defended the title, defeating Santiago González and Scott Lipsky in the final, 6–3, 7–6.

2012 PBZ Zagreb Indoors – Doubles: Dick Norman and Horia Tecău were the defending champions but Tecău chose not to compete and Norman teamed up with James Cerretani.  They lost in the first round to Benjamin Becker and Alexander Waske. <br>

2009 Zenith Tennis Cup – Doubles: Yves Allegro and Horia Tecău were the defending champions, however Tecău chose to not participate.

Jeļena Ostapenko: Jeļena Ostapenko, also known as Aļona Ostapenko (born 8 June 1997), is a Latvian professional tennis player.  On 11 September 2017, she reached her best singles ranking of world number 10 in the Women's Tennis Association (WTA), and she peaked at world number 32 in the WTA doubles rankings on 19 June 2017.

Supporting paragraphs: Horia Tecău Jeļena Ostapenko
Answer: tennis