Question: What profession does Roberta Vinci and Jeļena Ostapenko have in common?

Context paragraphs:
2015 Wimbledon Championships – Girls' Singles: Jeļena Ostapenko was the defending champion, but entered the Women's singles instead.

2016 St. Petersburg Ladies' Trophy – Singles: Jeļena Ostapenko was the defending champion, but lost in the first round to Yanina Wickmayer.

2014 Orto-Lääkärit Open – Doubles: Jeļena Ostapenko and Eva Paalma were the defending champions, but neither player chose to participate this year.

2014 Orto-Lääkärit Open – Singles: Jeļena Ostapenko was the defending champion, but chose not to participate this year.

2016 Engie Open Métropole 42 – Doubles: Gioia Barbieri and Jeļena Ostapenko were the defending champions, but both players chose not to participate.

Roberta Vinci: Roberta Vinci (] ; born 18 February 1983) is an Italian tennis player.  Up until 6 April 2015, she held the position of World No. 1 in doubles, while reaching a career-high of World No. 7 in singles in May 2016.  She is the fourth Italian woman to have reached the top 10 in singles, together with Flavia Pennetta, Francesca Schiavone and Sara Errani.  At 33 years and 4 days old, she is also the oldest ever player to make her first appearance in the Top 10.

1933 French Championships – Women's Singles: Margaret Scriven defeated Simonne Mathieu 6–2, 4–6, 6–4 in the final to win the Women's Singles tennis title at the 1933 French Championships.  It was the last time an unseeded player won the French Championships/French Open until Jeļena Ostapenko did so at the 2017 French Open.

Jeļena Ostapenko career statistics: This is a list of the main career statistics of professional Latvian tennis player Jeļena Ostapenko.  She was the champion of 2017 French Open.

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.

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.

Supporting paragraphs: Roberta Vinci Jeļena Ostapenko
Answer: tennis player