Helmsley was being highlighted again in 1997, winning the 1997 King of the Ring tournament by defeating Mankind in the finals. Later that year, Shawn Michaels, Helmsley, Chyna and Rick Rude formed D-Generation X (DX). This stable became known for pushing the envelope, as Michaels and Helmsley made risqué promos—using the catchphrase "Suck It" and a "crotch chop" hand motion—and sarcastically derided Bret Hart and Canada. By that point, Helmsley had fully dropped the "blueblood snob" gimmick, appearing in T-shirts and leather jackets. During this period, his ring name was shortened to simply Triple H, even though he would still be referred for a while as Helmsley from time to time and Hunter for the rest of his career. Even after the DX versus Hart Foundation storyline ended, he continued to feud with the sole remaining Hart family member Owen over the European Championship. This ended in a match between the two at WrestleMania XIV, with the stipulation that Chyna had to be handcuffed to then-Commissioner Sgt. Slaughter. Triple H won after Chyna threw powder into Slaughter's eyes, momentarily "blinding" him and allowing her to interfere in the match.After WrestleMania, Michaels was forced into temporary retirement due to a legitimate back injury sustained at the Royal Rumble, with Triple H taking over the leadership position in DX, claiming that his now-former associate had "dropped the ball". He introduced the returning X-Pac the night after WrestleMania and joined forces with The New Age Outlaws. As 1998 went along, DX became more popular, turning the group from villains to fan favorites. During this time, he adopted an entrance gimmick of asking the crowd "Are you ready? I said, are you ready?", followed by a parody of rival promotion WCW's ring announcer Michael Buffer's famous catch-phrase, "Let's get ready to rumble", substituting the word "rumble" with the DX slogan, "suck it". Also during this time, Triple H began a feud with the leader of the Nation of Domination and rising WWF villain, The Rock. This storyline rivalry eventually led to a feud over the Intercontinental Championship, which Triple H won in a ladder match at SummerSlam. He did not hold the title long, however, as he was sidelined with a legitimate knee injury. When The Rock won the WWF Championship at Survivor Series, the rivalry between the two continued, as DX fought The Corporation stable of which The Rock was the main star and Triple H received a shot at the WWF Championship on the January 25, 1999 Raw Is War in an "I Quit" match, but the match ended when Triple H was forced to quit or see his aide Chyna chokeslammed by Kane. This began a new angle for Triple H, as Chyna betrayed him by attacking him after the match and joining The Corporation.At WrestleMania XV, Triple H lost to Kane after Chyna interfered on his behalf and she was thought to have rejoined DX. Later on in the night, he betrayed his long-time friend and fellow DX member X-Pac by helping Shane McMahon retain the European Championship and joined The Corporation. turning heel in the process. In April, he started to move away from his DX look, taping his fists for matches, sporting new and shorter wrestling trunks and adopting a shorter hairstyle. His gimmick changed as he fought to earn a WWF Championship opportunity. After failed attempts at winning the championship, Triple H and Mankind challenged then WWF Champion Stone Cold Steve Austin to a triple threat match at SummerSlam, which featured Jesse "The Body" Ventura as the special guest referee. Mankind won the match by pinning Austin. The following night on Raw Is War, Triple H defeated Mankind to win his first WWF Championship. He dropped the WWF Championship to Mr. McMahon on the September 16, 1999 episode of SmackDown! before regaining it at Unforgiven in a Six-Pack Challenge that included Davey Boy Smith, Big Show, Kane, The Rock and Mankind. He defeated Stone Cold Steve Austin at No Mercy before dropping the title to Big Show at

Question: Whom did Helmsled had to defeat in order to win 1997 tournament?
Answer: Mankind