Title: Elimination Chamber (2018)
Content:  The main event was the first-ever seven-man Elimination Chamber match with the victor becoming the number one contender against Brock Lesnar for the Universal Championship at WrestleMania 34. Due to the extra participant, three men began the match instead of two, which were The Miz, Seth Rollins, and Finn Bálor. John Cena entered the match as the fourth entrant, followed by Roman Reigns and Braun Strowman. Strowman performed a running powerslam on The Miz to eliminate him. The last man to enter the match was Elias. Cena performed AA and Reigns performed a Spear on Strowman able kickout. Strowman then eliminated Elias, Cena, Bálor, and Rollins by performing a running powerslam on each of them. The final two were Strowman and Reigns. In the climax, Reigns performed three superman punches and two spears on Strowman to win the match and earn the right to challenge Brock Lesnar for the Universal Championship at WrestleMania 34. After the match, Strowman attacked Reigns with two running powerslams and tackled Reigns through a pod.
Title: Elimination Chamber (2018)
Content:  Six matches were contested at the event, including one on the Kickoff pre-show. In the main event, Roman Reigns won the first-ever seven-man Elimination Chamber match to become the number one contender against Brock Lesnar for the Universal Championship at WrestleMania 34. On the undercard, Alexa Bliss retained the Raw Women's Championship in the first-ever women's Elimination Chamber match, and Asuka defeated Nia Jax to extend her undefeated streak and to prevent Jax from being added to her WrestleMania 34 championship match. The event was also notable for Ronda Rousey signing her Raw contract, where she had a confrontation with Chief Operating Officer Triple H and Raw Commissioner Stephanie McMahon, which was the former's first appearance since the night after Survivor Series in November 2017.
Title: Elimination Chamber (2018)
Content:  Rollins, thus making it a fatal five-way. Rollins and Bálor both simultaneously pinned Wyatt, and it was decided that both would be a part of the Elimination Chamber match, marking the first seven-man chamber match. The following week, all seven men participated in a gauntlet match that began with Reigns and Rollins. Reigns was eliminated followed by Cena. Elias then eliminated Rollins, but was in turn eliminated by Bálor, who was eliminated by The Miz. Strowman won the gauntlet match by pinning The Miz in what was the longest match in WWE history, lasting nearly two hours. On the January 29 episode of Raw, Commissioner Stephanie 
Title: Elimination Chamber (2011)
Content:  The main event was an Elimination Chamber match for a WWE Championship match at Wrestlemania XXVII between CM Punk, Randy Orton, King Sheamus, John Morrison, John Cena and R-Truth. Sheamus and Morrison started the match while the other four men were locked inside pods. Orton entered at #3 and Punk entered at #4 but Punk's pod would not open, allowing Orton to attack Punk. Punk was eliminated by Orton after an RKO but the Anonymous Raw General Manager announced that Punk would re-enter the match. Cena entered at #4 and R-Truth entered at #5. R-Truth was eliminated by Sheamus after a Brogue Kick. Punk entered at #6 and eliminated Orton after a GTS. Sheamus was eliminated by Morrison after a Crossbody from the top of the chamber. Morrison was eliminated by Punk after a GTS. Cena eliminated Punk after an Attitude Adjustment onto the chamber floor to win a WWE Championship match at Wrestlemania XXVII.
Title: Elimination Chamber
Content:  contested by six or seven participants: two or three starting in the ring, while the other four are held within each inner chamber. The Elimination Chamber in February 2018 featured a seven-man chamber match in which three participants began. Every five minutes, one of the four participants within an inner chamber enters the match. This continues until all four have been released, meaning an Elimination Chamber match typically lasts over twenty or more minutes. The objective of the match is to eliminate each opponent from the match by scoring a pinfall or a submission. These can occur in the ring or on the 
Title: Elimination Chamber (2010)
Content:  The Elimination Chamber match was originally created in 2002 and held at various other pay-per-views, including the preceding No Way Out event. The Chamber itself is a circular steel cage, consisting of chains and girders that surrounds the ring. Four pods are enclosed within the chamber, one behind each ring post, which are on a steel platform surrounding the outside of the ring. Typically six wrestlers compete in the match; two start the match while the other four are enclosed within the pods and released at random at specific time intervals. Wrestlers can only be eliminated via pinfall or submission, and the last wrestler left is the winner. For the Elimination Chamber pay-per-view, both of WWE's world championships, Raw's WWE Championship and SmackDown's World Heavyweight Championship, were to be defended in separate Elimination Chamber matches.
Title: Elimination Chamber (2017)
Content:  The 2017 Elimination Chamber (known as No Escape in Germany) was the seventh Elimination Chamber professional wrestling event produced by WWE. It was held exclusively for wrestlers from the promotion's SmackDown brand division. The event aired on pay-per-view (PPV) and the WWE Network and took place on February 12, 2017, at the Talking Stick Resort Arena in Phoenix, Arizona. It was the first Elimination Chamber event to be held since the 2015 event and was WWE's first pay-per-view to feature three women's matches on the main card. Eight matches were contested at the event, including one on the Kickoff pre-show. In the main event, Bray Wyatt won the titular Elimination Chamber match to win the WWE Championship, the first singles championship of his career. On the undercard, Naomi defeated Alexa Bliss to win the SmackDown Women's Championship, marking her first championship in WWE, Randy Orton defeated Luke Harper, American Alpha (Chad Gable and Jason Jordan) retained the SmackDown Tag Team Championship in a tag team turmoil match, and Becky Lynch defeated Mickie James.
Title: Elimination Chamber (2017)
Content:  the match. Breezango were eliminated after Rhyno performed a Gore on Fandango. The Vaudevillians entered the match next, but were quickly eliminated when Slater pinned Aiden English after a Smash Hit. The Usos came in next and eliminated Slater and Rhyno when Jimmy performed a Superkick on Slater. American Alpha, the reigning champions, entered next and eliminated The Usos when Gable pinned Jey with a Schoolboy. The Usos then attacked American Alpha before being escorted out by officials. The Ascension, the final team to enter the match, executed the Fall of Man on Jordan, but Gable broke up the pinfall. Gable and Jordan performed the Grand Amplitude on Viktor to retain the title. In the fourth match, Nikki Bella fought Natalya. Natalya applied the 
Title: Elimination Chamber (2011)
Content:  his fellow commentator Michael Cole stopped Lawler from climbing the ladder. On the January 31 episode of Raw, the Raw general manager announced a Raw Rumble match, to determine the WWE Championship contender at Elimination Chamber, while the losing participants would be entered into an Elimination Chamber match to determine who will face the WWE Champion at WrestleMania XXVII. The participants were CM Punk, Randy Orton, King Sheamus, John Morrison, John Cena, Jerry Lawler, and R-Truth. Lawler last eliminated Sheamus to win the battle royal to earn himself the title match, while the other six contestants went on to participate in the Raw Elimination 
Title: WWE Elimination Chamber
Content:  The Elimination Chamber event centers around the Elimination Chamber match, and the event typically includes one or two main event matches that are contested inside the structure, either with championships or future opportunities at championships at stake. The match is generally contested by six participants (or six tag teams for a tag team Chamber match), with two beginning the bout in the ring, while the other four are held within a smaller chamber within the structure. In the case of a seven-person match, which occurred at the 2018 event, three wrestlers begin the match instead of two. Every five minutes, one of the four participants (or teams) within an inner chamber is released 

Question: who won the 7 man elimination chamber match?
Answer: Roman Reigns.