#1 AJ Styles - IWGP Heavyweight Championship
Prince Devitt departed from NJPW and ended his reign as the leader of the Bullet Club back in 2014 when he lost a "Loser Leaves Town Match" against former tag team partner Ryusuke Taguchi.
As Devitt prepared for his journey as Finn Balor in WWE, NJPW secured the services of another top gaijin Superstar who made his debut on the same night as the former's departure from Japan.
Enter AJ Styles!
At Invasion Attack, 2014, 'The Phenomenal One' attacked Kazuchika Okada after his match and laid out 'The Rainmaker' with a Styles Clash, only to reveal a Bullet Club t-shirt underneath.
Under his NJPW contract, Styles wrestled his first match at Wrestling Dontaku, 2014 and won the IWGP Heavyweight Championship in his first attempt. The win also made Styles the first American to win the title since Brock Lesnar in 2005. After losing the title to Hiroshi Tanahashi in his third defense, the Georgia star was determined to regain his title.
In early 2011, Styles did exactly that when he bested 'The Ace' and won the IWGP Heavyweight Championship in order to become a two-time champion in New Japan Pro Wrestling.
Throughout Styles' two reigns as IWGP Heavyweight Champion, 'The Phenomenal One' put up some of the most memorable matches and title defenses in NJPW, especially against the likes of Minoru Suzuki and Kota Ibushi.