Question: Who is the winner of 2018 royal rumble?

context: Nine matches were contested at the event, including three on the Kickoff pre-show. In the main event, Asuka won the first-ever women's Royal Rumble match, which was also the second women's match to main event a WWE pay-per-view, and the first to main event one of WWE's "Big Four" pay-per-views. The men's Royal Rumble match was won by Shinsuke Nakamura. Other prominent matches included Brock Lesnar retaining the Universal Championship in a triple threat match against Braun Strowman and Kane, and AJ Styles retained the WWE Championship against Kevin Owens and Sami Zayn in a handicap match. The event was also notable for the surprise debut of former UFC star Ronda Rousey following the women's match, officially confirming that she had signed full-time with WWE.
question: Who won the Women's 2018 royal rumble?
short_answers: Asuka
context: Nine matches were contested at the event, including three on the Kickoff pre-show. In the main event, Asuka won the first-ever women's Royal Rumble match, which was also the second women's match to main event a WWE pay-per-view, and the first to main event one of WWE's "Big Four" pay-per-views. The men's Royal Rumble match was won by Shinsuke Nakamura. Other prominent matches included Brock Lesnar retaining the Universal Championship in a triple threat match against Braun Strowman and Kane, and AJ Styles retained the WWE Championship against Kevin Owens and Sami Zayn in a handicap match. The event was also notable for the surprise debut of former UFC star Ronda Rousey following the women's match, officially confirming that she had signed full-time with WWE.
question: Who won the Men's 2018 royal rumble?
short_answers: Shinsuke Nakamura
context: Nine matches were contested at the event, including three on the Kickoff pre-show. In the main event, Asuka won the first-ever women's Royal Rumble match, which was also the second women's match to main event a WWE pay-per-view, and the first to main event one of WWE's "Big Four" pay-per-views. The men's Royal Rumble match was won by Shinsuke Nakamura. Other prominent matches included Brock Lesnar retaining the Universal Championship in a triple threat match against Braun Strowman and Kane, and AJ Styles retained the WWE Championship against Kevin Owens and Sami Zayn in a handicap match. The event was also notable for the surprise debut of former UFC star Ronda Rousey following the women's match, officially confirming that she had signed full-time with WWE.
question: Who won the women's Royal Rumble match in 2018?
short_answers: Asuka
context: Nine matches were contested at the event, including three on the Kickoff pre-show. In the main event, Asuka won the first-ever women's Royal Rumble match, which was also the second women's match to main event a WWE pay-per-view, and the first to main event one of WWE's "Big Four" pay-per-views. The men's Royal Rumble match was won by Shinsuke Nakamura. Other prominent matches included Brock Lesnar retaining the Universal Championship in a triple threat match against Braun Strowman and Kane, and AJ Styles retained the WWE Championship against Kevin Owens and Sami Zayn in a handicap match. The event was also notable for the surprise debut of former UFC star Ronda Rousey following the women's match, officially confirming that she had signed full-time with WWE.
question: Who won the men's Royal Rumble match in 2018?
short_answers: Shinsuke Nakamura

long_answer: The 2018 Royal Rumble was a professional wrestling pay-per-view (PPV) event and WWE Network event produced by WWE. Nine matches were contested at the event, including three on the Kickoff pre-show. In the main event, Asuka won the first-ever women's Royal Rumble match, which was also the second women's match to main event a WWE pay-per-view, and the first to main event one of WWE's "Big Four" pay-per-views. The men's Royal Rumble match was won by Shinsuke Nakamura. 
long_answer: The 2018 Royal Rumble was a professional wrestling pay-per-view (PPV) event and WWE Network event produced by WWE featuring wrestlers primarily from their Raw and SmackDown brand divisions, as well as surprise appearances from competitors on the NXT brand. In the main event, Asuka won the first-ever women's Royal Rumble match, which was also the second women's match to main event a WWE pay-per-view, and the first to main event one of WWE's "Big Four" pay-per-views. The men's Royal Rumble match was won by Shinsuke Nakamura.