# Roki Sasaki

Roki Sasaki (Japanese: 佐々木 朗希, Hepburn: Sasaki Rōki, born November 3, 2001), nicknamed "the Monster of the Reiwa Era" (令和の怪物, Reiwa no Kaibutsu), is a Japanese professional baseball pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). He previously played in the Nippon Professional Baseball (NPB) for the Chiba Lotte Marines. He made his NPB debut in 2021 for the Marines and signed with the Dodgers in 2025.
Sasaki set a new Japanese high school baseball record with a fastball recorded at 101 miles per hour (163 km/h). The Marines chose Sasaki in the first overall selection of the 2019 NPB draft. Taking care to avoid subjecting their rookie to premature physical stresses, the Marines held back until the 2021 season before allowing him to make his NPB debut. He threw a perfect game on April 10, 2022, in which he tied the NPB record for strikeouts in one game and set a new record for consecutive strikeouts.

## Early life

Sasaki is from Rikuzentakata in the Iwate Prefecture. Born in 2001, he was named after the villain Rouki from Hyakujuu Sentai Gaoranger, a Super Sentai show that was aired in the same year. He was in the third grade during the 2011 Great East Japan earthquake. The resulting tsunami swept away his house. His father and grandparents died, while Sasaki, his mother, and his two brothers had to live in a nursing home during the recovery. The family moved to Ōfunato the next year and Sasaki began to play baseball at his new school. He graduated at Ōfunato High School.

## Amateur career

Though Sasaki was recruited by other high schools, he chose to attend Ofunato High School to remain with his teammates. He was nicknamed "the Monster of the Reiwa Era" (Reiwa no Kaibutsu 令和の怪物) because of his 101 mph (163 km/h) fastball in high school. His fastball velocity broke the Japanese high school record set by Shohei Ohtani, and Sasaki began to earn comparisons to Ohtani. His nickname is a reference to Daisuke Matsuzaka, who was known as "the Monster of the Heisei Era".
Major League Baseball (MLB) teams hoped that Sasaki would pursue an MLB career, but he opted to remain with his high school team during the Japanese High School Baseball Championship. Sasaki's manager rested him in the qualifying game where Ofunato was eliminated, drawing criticism. Sasaki announced that he would pitch in Nippon Professional Baseball (NPB), declaring for the NPB draft.

## Professional career
### Chiba Lotte Marines
#### 2019–2021

After four teams attempted to select Sasaki in the 2019 NPB draft, the Chiba Lotte Marines of NPB's Pacific League won the lottery for the rights to the first overall selection, and selected Sasaki. He received a signing bonus of ¥100 million (US$911,161.73). To protect his arm, the Marines did not allow Sasaki to appear in a game during the 2020 season. He made his NPB debut on May 16, 2021. For the 2021 season, Sasaki had a 3–2 win–loss record, a 2.27 earned run average (ERA), and 68 strikeouts in 63+1⁄3 innings pitched across 11 appearances. Sasaki made his postseason debut for the Marines in the 2021 Pacific League Climax Series, striking out 10 batters while allowing one run in six innings, as Lotte defeated the Tohoku Rakuten Golden Eagles.

#### 2022 season

On April 10, 2022, Sasaki pitched a perfect game against the Orix Buffaloes. It was the 16th perfect game in NPB history, the first since Hiromi Makihara's perfect game in 1994, and the 94th no-hitter in NPB history, the first since August 15, 2020. Sasaki tied the NPB record set by Koji Noda for total strikeouts in one game, with 19, and set a new NPB record for consecutive strikeouts, having struck out 13 batters in a row. This also became a new world record, beating out the 10 consecutive strikeouts achieved in MLB by Corbin Burnes, Tom Seaver, and Aaron Nola.
In his next start, on April 17, Sasaki pitched eight perfect innings against the Hokkaido Nippon-Ham Fighters, before getting taken out from the game before the ninth inning by manager Tadahito Iguchi to protect Sasaki's health. He recorded 14 strikeouts on 102 pitches, including striking out the side in the eighth inning with a 101 mph fastball. Sasaki finished the outing having retired 52 consecutive batters, setting an NPB record. The MLB record for retiring consecutive batters is 46 by Yusmeiro Petit. Sasaki allowed a hit on the first pitch that he threw in his next game, on April 24. He finished the season 9–4 with a 2.02 ERA and 173 strikeouts in 129+1⁄3 innings pitched.

#### 2023–2024

On April 28, 2023, Sasaki threw 4 pitches at a speed of 165 km/h (102.5 mph), which tied the record held by Shohei Ohtani for the fastest pitch by a Japanese player in NPB history. In the 2023 season, he was 7–4 with a 1.78 ERA and 135 strikeouts in 91 innings and he followed that up with a 10–5 record, 2.35 ERA and 129 strikeouts in 111 innings in 2024. On November 8, 2024, the Marines posted Sasaki to allow him to pursue an opportunity with Major League Baseball.

### Los Angeles Dodgers

On January 22, 2025, Sasaki signed a contract with the Los Angeles Dodgers, which featured a $6.5 million signing bonus. Because he was under the age of 25 at the time, regulations required that he had to sign a minor league deal. Shortly after his signing, Baseball America and MLB.com both named him the No. 1 prospect in MLB entering the 2025 season.
Sasaki made the Dodgers opening day roster and was announced as the starter for the second game of the season in the MLB Tokyo Series 2025.

## International career

Sasaki pitched for the Japanese national baseball team in the 2023 World Baseball Classic (WBC). He made his first start of the competition on March 11 against the Czech Republic, pitching 3+2⁄3 innings while giving up two hits, an unearned run, two walks, and recording eight strikeouts. On March 20, he started in Japan's WBC semifinal game against Mexico, pitching for four innings while giving up five hits, three runs, and recording three strikeouts. He finished the tournament at 1–0 with a 3.52 ERA and 11 strikeouts across 7+2⁄3 innings, receiving a gold medal in Japan's championship victory over the United States.
Sasaki's performance in the 2023 WBC received international media attention. In his start against Mexico, his average four-seam fastball velocity was 100.5 mph (161.7 km/h) and topped out at 101.9 mph (164.0 km/h). His split-finger fastball averaged 91.2 mph (146.8 km/h) and generated 31.4 inches (800 mm) of vertical break. Three Major League Baseball executives compared Sasaki's abilities at age 21 to those of Stephen Strasburg, who was selected first overall in the 2009 Major League Baseball draft and was considered one of the most anticipated prospects in the league's history.

## Playing style

Sasaki is listed as 6-foot-2-inch (1.88 m) and 187-pound (85 kg). A right-handed pitcher with a three-quarters delivery, he throws a fastball topping out at 102.5 mph (165 km/h). In the 2022 season, his fastball averaged 98.4 mph (158.3 km/h) as a starter. He also throws a forkball, a curveball, and a slider. The forkball is the best off-speed pitch in his arsenal.