Roki Sasaki

Roki Sasaki Bio

Roki Sasaki is a Japanese professional baseball pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). Nicknamed “the Monster of the Reiwa Era,” Sasaki has earned international recognition for his extraordinary pitching abilities, including a perfect game in 2022 while playing in Japan’s Nippon Professional Baseball (NPB). Born in Rikuzentakata, Iwate, Japan, in 2001, Sasaki developed his craft in the aftermath of the devastating 2011 Tōhoku earthquake and tsunami that claimed the lives of his father and grandparents. After making his professional debut with the Chiba Lotte Marines in 2021, he transitioned to MLB in 2025, signing with the Los Angeles Dodgers and quickly making an impact on baseball’s biggest stage.

Early Life and Background

Roki Sasaki was born on November 3, 2001, in Rikuzentakata, Iwate Prefecture, Japan. His parents named him after Rouki, the villain from Hyakujuu Sentai Gaoranger, a Super Sentai television series that aired in the same year. Sasaki was in the third grade when the catastrophic Tōhoku earthquake and tsunami struck Japan in 2011. The tsunami destroyed his family home, and his father and grandparents tragically lost their lives in the disaster. Sasaki, his mother, and his two brothers were forced to relocate to a nursing home facility during the lengthy recovery period.

The family eventually settled in Ōfunato the following year, where young Roki began playing baseball at his new school. He chose to attend Ōfunato High School rather than transfer to other programs that had recruited him, preferring to remain with his teammates from middle school. During his high school career, Sasaki developed a blazing fastball that would eventually draw comparisons to some of Japan’s greatest pitchers.

Path to Professional Baseball

While playing for Ōfunato High School, Sasaki’s fastball velocity reached 101 miles per hour (163 kilometers per hour), shattering the Japanese high school record previously held by Shohei Ohtani. This remarkable feat earned him the nickname “the Monster of the Reiwa Era,” a reference to the current Japanese imperial era. The nickname was also inspired by Daisuke Matsuzaka, who was known as “the Monster of the Heisei Era” during his dominant pitching career. MLB teams closely monitored Sasaki’s high school career, hoping he would pursue an American professional opportunity, but he chose to remain with his high school team for the Japanese High School Baseball Championship.

Following his high school career, Sasaki declared for the NPB draft. In the 2019 NPB draft, four teams attempted to select him, and the Chiba Lotte Marines won the lottery for the first overall selection, acquiring the rights to sign him. The Marines offered Sasaki a signing bonus of ¥100 million (approximately $911,000). To protect his young arm from premature physical stress, the organization made the strategic decision to hold him out of game action during the 2020 season, allowing his development to proceed gradually.

Roki Sasaki Career

Chiba Lotte Marines (2021–2024)

Sasaki made his NPB debut on May 16, 2021, for the Chiba Lotte Marines. In his rookie season, he compiled a 3–2 win–loss record with a 2.27 earned run average and 68 strikeouts across 63 and one-third innings pitched in 11 appearances. His postseason debut came in the 2021 Pacific League Climax Series, where he delivered an impressive performance, striking out 10 batters while allowing only one run in six innings against the Tohoku Rakuten Golden Eagles, helping Lotte secure the series victory.

The 2022 season became a historic campaign for Sasaki. On April 10, 2022, he pitched a perfect game against the Orix Buffaloes, marking the 16th perfect game in NPB history and the first since Hiromi Makihara’s effort in 1994. This dominant performance saw him tie the NPB single-game strikeout record with 19 and establish a new world record with 13 consecutive strikeouts, surpassing the previous MLB record of 10 shared by Corbin Burnes, Tom Seaver, and Aaron Nola. In his very next start on April 17, Sasaki pitched eight perfect innings against the Hokkaido Nippon-Ham Fighters before manager Tadahito Iguchi removed him to protect his health. He retired 52 consecutive batters overall, setting a new NPB record that season.

Sasaki continued his excellence through 2023 and 2024. In April 2023, he tied Shohei Ohtani’s record for the fastest pitch by a Japanese player in NPB history at 102.5 miles per hour. He finished the 2023 season with a 7–4 record, 1.78 ERA, and 135 strikeouts in 91 innings, earning his second consecutive All-Star selection. The following year, he went 10–5 with a 2.35 ERA and 129 strikeouts in 111 innings. On November 8, 2024, the Marines posted Sasaki, allowing him to pursue his Major League Baseball opportunity.

Los Angeles Dodgers (2025–Present)

On January 22, 2025, Sasaki signed a contract with the Los Angeles Dodgers, receiving a $6.5 million signing bonus. Because he was under 25 years of age at the time of signing, MLB regulations required him to sign a minor league contract. Both Baseball America and MLB.com immediately recognized his potential by naming him the number one prospect in all of MLB heading into the 2025 season.

Sasaki made the Dodgers’ opening day roster and was announced as the starter for the second game of the season during the MLB Tokyo Series 2025 against the Chicago Cubs on March 19, 2025. In his MLB debut, he allowed one run on one hit and five walks while striking out three, with his first major league strikeout coming against Seiya Suzuki. He earned his first major league win on May 3 against the Atlanta Braves. However, his rookie season encountered adversity when he was placed on the 15-day injured list on May 13 with a right shoulder impingement, later transferred to the 60-day injured list on June 20. Following an extensive rehabilitation assignment in the minor leagues, Sasaki was activated from the injured list on September 24 with the intention of working as a relief pitcher for the remainder of the season.

Despite the injury setback, Sasaki made a dramatic impact during the 2025 postseason. He recorded his first professional save by closing out the opening game of the National League Division Series against the Philadelphia Phillies. He appeared in three games during the series, earning saves in the first two games and contributing three perfect innings in relief during the decisive fourth game. Sasaki then pitched two and two-thirds innings over two games in the 2025 World Series, which the Dodgers won in seven games, earning his first career World Series championship.

Driving Style and Strengths

Standing at 6 feet 2 inches (1.88 meters) and weighing 187 pounds (85 kilograms), Sasaki operates as a right-handed pitcher with a three-quarters delivery. His primary weapon is a four-seam fastball that consistently sits between 95–100 miles per hour and has touched 102.5 miles per hour. In NPB, his signature pitch was an 87–92 mile per hour power split-finger fastball known for exceptional vertical movement. Upon joining the Dodgers, he modified this offering with a forkball-like grip that produced less spin and greater downward action, often drawing comparisons to a knuckleball. During the 2026 season, he introduced a split-finger with arm-side run to complement his existing repertoire. Sasaki also experimented with various breaking balls throughout his career, including a sweeper during his NPB tenure and early MLB appearances.

Notable Events and Milestones

Sasaki’s perfect game on April 10, 2022, stands as one of the most dominant pitching performances in baseball history, combining a no-hitter with 19 strikeouts and 13 consecutive strikeouts that set a world record. His high school fastball velocity of 101 miles per hour broke the Japanese record held by Shohei Ohtani, immediately establishing him as a generational pitching talent. International attention intensified during the 2023 World Baseball Classic, where three MLB executives compared his abilities at age 21 to those of Stephen Strasburg, one of the most anticipated prospects in American baseball history.

Roki Sasaki Career Wins

Throughout his professional career spanning NPB and MLB, Sasaki has accumulated impressive statistics with 33 total wins across both leagues and over 600 strikeouts. His dominance in Japan established him as one of the premier pitchers in the sport globally, while his transition to Major League Baseball has continued to showcase his elite abilities on the sport’s highest stage.

Nippon Professional Baseball Highlights

In four seasons with the Chiba Lotte Marines from 2021 to 2024, Sasaki compiled a 29–15 win-loss record with a stellar 2.10 earned run average and 505 total strikeouts. His 2022 perfect game marked the pinnacle of his NPB career, while his consistency across multiple seasons earned him back-to-back All-Star selections in 2022 and 2023. The Marines posted him for MLB transfer on November 8, 2024, concluding his remarkable Japanese career.

Major League Baseball Highlights

Sasaki’s MLB career began with the Dodgers in March 2025, and through the 2026 season, he has recorded four wins against six losses with a 4.74 ERA and 100 strikeouts. Despite an injury-plagued rookie season that included time on the injured list, he made immediate postseason contributions, earning multiple saves during the Dodgers’ championship run. His first career World Series title came in 2025 when the Dodgers defeated the Philadelphia Phillies in seven games.

Roki Sasaki Family

Family Background and Racing Lineage

Sasaki’s family experienced profound tragedy during the 2011 Tōhoku earthquake and tsunami, which claimed the lives of his father and both grandparents. At just 9 years old, he survived the disaster along with his mother and two brothers, though the family lost their home and was displaced to a nursing home facility during the extended recovery period. The following year, they relocated to Ōfunato, where Sasaki began rebuilding both his life and his baseball career.

Personal Life

Sasaki continues to carry the memory of his family’s tragedy as motivation throughout his baseball career. The earthquake and tsunami experiences shaped his resilience and determination, qualities that have defined his rise from a disaster survivor to one of baseball’s most exciting young pitchers. He maintains strong connections to his Iwate Prefecture roots and has represented the region with distinction on both national and international stages.

2025 Season Performance

The 2025 season marked a transformative year in Sasaki’s professional career as he made the highly anticipated transition from NPB to MLB. After signing with the Los Angeles Dodgers on January 22, he quickly established himself as the top prospect in all of baseball, earning that distinction from both Baseball America and MLB.com. His debut came in the MLB Tokyo Series on March 19 against the Chicago Cubs, a fitting stage given his Japanese heritage and the global attention surrounding his stateside arrival.

Despite earning his first major league win on May 3 against the Atlanta Braves, Sasaki’s rookie campaign faced significant challenges. A right shoulder impingement forced him to the injured list on May 13, eventually requiring a transfer to the 60-day injured list. The Dodgers exercised caution with their prized prospect, allowing him extensive rehabilitation time in the minor leagues before activating him in late September with a modified role as a relief pitcher for the remainder of the season.

The postseason redemption story proved Sasaki’s championship pedigree. His three consecutive relief appearances against the Philadelphia Phillies in the National League Division Series showcased his adaptability and poise under pressure. The Dodgers’ dramatic seven-game World Series victory gave Sasaki his first championship ring, fulfilling expectations that had followed him since his high school days when he earned the nickname “the Monster of the Reiwa Era.”