Title: Royal Rumble (2018)
Content:  Raw, with a larger roster of women on the main rosters, Raw Commissioner Stephanie McMahon scheduled the first-ever women's Royal Rumble match for the 2018 Royal Rumble, with the winner receiving a match at WrestleMania 34 for the top championship of their choice: Raw's Women's Championship or SmackDown's Women's Championship. Both brands' respective commissioners and general managers agreed that the women's match would have all of the same rules as the men's match, including having 30 participants. Stephanie was announced to join the commentary team for the women's match, and television host Maria Menounos was announced to be the special guest ring announcer. At 
Title: Royal Rumble (2018)
Content:  matches. The Royal Rumble match generally features 30 wrestlers and the winner traditionally earns a world championship match at that year's WrestleMania. It was originally only contested by male wrestlers. However, for 2018, Raw Commissioner Stephanie McMahon scheduled the first-ever women's Royal Rumble match to be held at the 2018 Royal Rumble, which consequently made the 2018 event the first to include two Rumble matches, which is now standard. As a result, the winners of each match received a choice of which championship to challenge for at WrestleMania 34. The men could choose to challenge for either Raw's Universal Championship or SmackDown's WWE Championship, while the women had the choice between the Raw Women's Championship and the SmackDown Women's Championship.
Title: Royal Rumble (2018)
Content:  two Royal Rumble matches were contested on the card with the winners of each receiving a choice of which championship to challenge for at WrestleMania 34. The men could choose to challenge for either Raw's Universal Championship or SmackDown's WWE Championship, while the women had the choice between the Raw Women's Championship and the SmackDown Women's Championship. In total, nine matches were contested at the event, including three on the Kickoff pre-show. In the main event, Raw's Asuka won the first-ever women's Royal Rumble match by last eliminating SmackDown's Nikki Bella. This was also the second women's match to main 
Title: Royal Rumble (2018)
Content:  The main event was the first-ever 30-woman Royal Rumble match for a women's championship match at WrestleMania 34. Sasha Banks and Becky Lynch were the first and second entrants, respectively. There were numerous surprise entrants throughout the match - including Hall of Famers Lita, Jacqueline, Beth Phoenix, and Trish Stratus; NXT wrestlers Kairi Sane and NXT Women's Champion Ember Moon; and past stars Torrie Wilson, Molly Holly, Michelle McCool (who scored the most eliminations at 5), Vickie Guerrero, and Kelly Kelly. SmackDown's Nikki Bella, who had been on hiatus since WrestleMania 33, and Brie Bella were also unannounced entrants. Banks, Asuka (#25), Nikki, and Brie were the final four. Banks, Nikki, and Brie attacked Asuka, after which, Nikki and Brie eliminated Banks (who lasted the longest at nearly 55 minutes). Asuka attacked Nikki 
Title: Royal Rumble (2018)
Content:  The 2018 Royal Rumble was the 31st annual Royal Rumble professional wrestling event produced by WWE. It was held for wrestlers from the promotion's Raw and SmackDown brand divisions. The event aired on pay-per-view (PPV) and the WWE Network and took place on January 28, 2018, at the Wells Fargo Center in Philadelphia, Pennsylvania. It was the first to include a women's Royal Rumble match, and consequently, two Royal Rumble matches, which is now standard for the event. Traditionally, the Royal Rumble match winner receives a world championship match at that year's WrestleMania. With the introduction of a women's Royal Rumble 
Title: Royal Rumble (2018)
Content:  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 SmackDown's Shinsuke Nakamura, who last eliminated Raw's Roman Reigns. 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 mixed martial artist Ronda Rousey following the women's Rumble match, officially confirming that she had signed full-time with WWE.
Title: Clash of Champions (2017)
Content:  participants of the tournament included former champion Baron Corbin, Tye Dillinger, Xavier Woods, Aiden English, Mojo Rawley, and Zack Ryder. On the December 18 episode of Raw, Raw Commissioner Stephanie McMahon announced that the 2018 Royal Rumble would feature the first-ever women's Royal Rumble match. On SmackDown, SmackDown Women's Champion Charlotte Flair first addressed her victory over Natalya at Clash of Champions, then said that she would be waiting for the winner of the women's Royal Rumble match at WrestleMania 34. Naomi came out and became the first woman to announce her participation. They were then interrupted by The Riott Squad. Before they could announce their participation, Naomi stopped them 
Title: Royal Rumble (2019)
Content:  and the SmackDown Women's Championship. In total, ten matches were contested at the event, including three on the Kickoff pre-show. In the main event, Raw's Seth Rollins won the men's Royal Rumble match by last eliminating Braun Strowman, also from Raw, while SmackDown's Becky Lynch won the women's Royal Rumble match by lastly eliminating Charlotte Flair, also from SmackDown. In the opening bout, Lynch lost her SmackDown Women's Championship match against Asuka. Other prominent matches included Brock Lesnar retaining the Universal Championship against Finn Bálor, Daniel Bryan defeating AJ Styles to retain the WWE Championship, and Ronda Rousey defeating Sasha Banks to retain the Raw Women's Championship. The event also featured the return of Jeff Jarrett, who competed in his first WWE match since No Mercy in October 1999.
Title: Royal Rumble (2020)
Content:  the first Royal Rumble since 2010 in which there were three eligible championships for the Rumble winner to challenge for. In total, eight matches were contested at the event, including two on the Kickoff pre-show. In the main event, Raw's Drew McIntyre won the men's Royal Rumble match by last eliminating SmackDown's Roman Reigns, while Raw's Charlotte Flair won the women's Royal Rumble match by last eliminating NXT's Shayna Baszler. Other prominent matches saw "The Fiend" Bray Wyatt retain the Universal Championship against Daniel Bryan in a strap match, Roman Reigns defeated King Corbin in a Falls Count Anywhere match, and Becky Lynch defeated Asuka by submission to retain the Raw Women's Championship. The event also featured the in-ring return of Edge, who last wrestled in April 2011 before retiring from a neck injury, as well as MVP, who last wrestled for WWE in December 2010.
Title: Royal Rumble (2011)
Content:  Rumble match, which featured 40 participants from both brands instead of the usual number of 30—it has thus far been the only Royal Rumble match to have 40 participants. It was won by SmackDown's Alberto Del Rio, who last eliminated Raw's Santino Marella. The primary match on the Raw brand was for the WWE Championship, between reigning champion The Miz and Randy Orton, which Miz won to retain the title. The primary match on the SmackDown brand was Edge versus Dolph Ziggler for the World Heavyweight Championship, which Edge won to retain the title. The other featured match on the card was a fatal-four way match for the WWE Divas Championship in which Natalya defended the title against Eve Torres, Layla, and Michelle McCool; Torres won to win the championship.

Question: who won the 2018 women's royal rumble match?
Answer: Asuka.