Roki Sasaki: Height | Jersey | How Tall Is | How Old Is | Height & Weight

Roki Sasaki has emerged as one of baseball’s most talked-about young pitchers. From record-breaking feats in Japanese professional baseball to his bold move to Major League Baseball (MLB), his physical profile and on-field presence often spark curiosity among fans. In this 2000-word deep dive, we’ll explore everything from how tall Roki Sasaki is, to his weight, age, jersey number, career highlights, and more. We’ll also cover frequently asked questions to ensure you get a full picture.

1. Early Life & Background

Rōki Sasaki (佐々木 朗希) was born on November 3, 2001, in Rikuzentakata, Iwate Prefecture, Japan.

His childhood was marked by tragedy: the Great East Japan Earthquake of March 11, 2011 severely impacted his hometown and claimed the lives of his father and grandparents.

From a young age, Sasaki displayed outstanding talent on the mound. He attended Ofunato High School, where he earned the nickname “The Monster of the Reiwa Era” due to his blazing fastball performances (163 km/h in high school) and dominance.

In 2025, he made his MLB debut with the Los Angeles Dodgers, marking a major transition in his budding career.

2. Physical Profile: Height & Weight

What Is Roki Sasaki’s Height?

The most consistently reported measurement places Roki Sasaki at 6 feet 2 inches (188 cm).

Baseball-Reference lists him as 6’2″, 187 lb (188 cm, 84 kg) 
His BR Bullpen profile also confirms Height: 6’2″ and Weight: 187 lb. 
Yahoo Sports likewise lists 6’2″ / 187 lbs. 
Fox Sports echoes this measurement.

However, official Japanese baseball sources (e.g. Samurai Japan / Japan national team) list a slightly different height: 190 cm (≈ 6’3″) and weight 85 kg.

This discrepancy is not uncommon in international baseball — sometimes local sources, team rosters, or media reports round or adjust measurements for different audiences.

Thus, the commonly accepted height in U.S. / international reporting remains 6’2″ (188 cm).

What Is Roki Sasaki’s Weight?

Roki Sasaki’s weight is generally given as 187 lbs (≈ 84.9 kg) in Western sources.

Yet, again, Japanese sources like his national team profile list 85 kg for his weight, consistent with their rounding and reporting conventions.

In more rare instances, an NPB roster entry lists him as 192 cm / 92 kg, but that may reflect outdated or erroneous data.

Given the strong consistency among multiple U.S. and international baseball stats sources, the 187 lb / 84–85 kg figure is the most reliable for his current weight.

3. Age & Date of Birth

• Date of Birth: November 3, 2001

• Current Age (as of October 2025): 23 years old (turning 24 in November 2025)

Because his birthday is in late 2001, he falls in the typical “23-year-old rookie” age range in MLB.

4. Jersey Number & Team Representation

NPB & Samurai Japan (Japan National Team)

• In his national team and Samurai Japan roster, Sasaki has worn #14 as indicated on the official Samurai Japan site.

• In earlier years (including his time in NPB with the Chiba Lotte Marines), he has been associated with #11 / #14 depending on the tournament or roster.

MLB / Los Angeles Dodgers

• Upon signing with the Los Angeles Dodgers in 2025, Sasaki has been assigned #11.

• Fans have discussed and confirmed that his jersey will bear #11 in Dodgers uniforms.

So, to answer “What jersey number does Roki Sasaki wear?” — #11 in MLB with the Dodgers, though earlier in Japan he has appeared under #14 in national team play.

5. Career Highlights & Milestones

Roki Sasaki’s rapid ascent in the baseball world has been marked by multiple standout achievements:

Perfect Game (2022)

Perhaps his most famous feat: On April 10, 2022, while pitching for the Chiba Lotte Marines, Sasaki threw a perfect game (no hits, no walks, no errors) against the Orix Buffaloes — one of just a few in NPB history.

This performance solidified his status as a generational talent in Japan’s professional baseball landscape.

National & International Representation

• Sasaki pitched for Japan’s national team in the 2023 World Baseball Classic (WBC).

• In the WBC, he recorded multiple strikeouts and was a key arm in Japan’s championship run.

Signing with the Dodgers

In January 2025, Sasaki announced his decision to join the Los Angeles Dodgers, ending speculation about his MLB future.

His contract included a $6.5 million signing bonus and a minor league deal until he accrues enough MLB service time.

MLB Debut & Performance

Sasaki made his MLB debut on March 19, 2025, starting in the MLB Tokyo Series vs. the Chicago Cubs.

In his first outing, he allowed one run on one hit with five walks, and recorded three strikeouts. 
He earned his first major league win on May 3, 2025, vs. the Atlanta Braves.

Over the 2025 season (as of available data), he made eight starts before being placed on the injured list. Roki Sasaki height weight.

6. Scouting Report & Pitching Style

Scouts and analysts widely praise Sasaki for a combination of elite stuff and projectable mechanics. His ceiling is regarded as among the highest for pitchers of his generation.

Physical & Mechanical Traits

• He has a lean, athletic frame and well-proportioned mechanics.

• In 2024, analysts observed that his stride length / extension increased, while his release height remained consistent—suggesting tweaks to his delivery to manage arm stress while maximizing effectiveness.

• Scouts often refer to him as having ideal “projectable” traits, meaning he may grow stronger and remain durable over time.

Pitch Arsenal

Sasaki’s repertoire is advanced and multi-dimensional:

1. Four-seam Fastball — his primary weapon; has been clocked regularly exceeding 160 km/h (≈ 100+ mph) in certain outings.

2. Splitter / Split-finger — often considered his best off-speed pitch; creates sharp movement and induces swings and misses.

3. Curveball — a secondary breaking pitch to disrupt timing.

4. Slider — occasional pitch to mix in lateral movement.

He is praised for his control, command potential, and ability to mix speeds intelligently.

Potential & Upside

• Many scouts project Sasaki as a #1 pitchability upside — one of the top pitching prospects globally.

• Some comparisons liken him to elite arms like Stephen Strasburg or other Japanese imports who dominated early in MLB.

• The greatest caveat, as often noted, is health durability — balancing his aggressive delivery with injury prevention will be critical. Roki Sasaki height weight.

7. Transition to MLB

Sasaki’s move from NPB to MLB was a highly anticipated storyline in international baseball.

• He was posted by the Chiba Lotte Marines, allowing MLB teams a window to negotiate.

• Because he was under age 25, his contract with the Dodgers was subject to international bonus pool limitations and was a minor league deal until he accrues MLB service time.

• His signing created significant buzz, especially given comparisons to Shohei Ohtani and Yoshinobu Yamamoto (both Japanese stars in MLB).

In his rookie MLB season, Sasaki saw mixed results: high strikeouts but also some control issues and walks.

By mid-season, he was placed on the injured list (right shoulder impingement), and later transferred to the 60-day IL. 
After rehabilitation stints, he was activated in September 2025 and used in relief roles in addition to starting duties.

His overall MLB performance thus far suggests high upside but also the expected growing pains of a young imported arm.

8. Injury Concerns & Future Outlook

Injury History

• In his 2025 MLB season, Sasaki encountered a right shoulder impingement, which sidelined him for a portion of the year.

• He was placed on the 15-day IL and later moved to the 60-day IL because of persistent recovery.

• Analysts have flagged injury risk as a key concern, particularly given his aggressive mechanics and high workload in Japan. Roki Sasaki height weight.

Future Projection

If he remains healthy and continues to refine control and pitch command, Sasaki has the potential to become a frontline MLB starter. His arsenal is elite, and his frame suggests he can mature into an innings eater.

However, the path forward is not guaranteed. His ability to adapt to MLB hitters, manage pitch counts, and stay injury-free will be key determinants of his long-term success.

9. FAQs

Q1: How tall is Roki Sasaki?
A1: Most sources list him at 6’2″ (188 cm). Some Japanese profiles indicate 190 cm, but the 6’2″ figure is widely accepted in international stats databases.

Q2: What is Roki Sasaki’s weight?
A2: He is generally listed at 187 lbs (≈ 84.9 kg) in U.S./international baseball records. Some Japanese sources list 85 kg. Roki Sasaki height weight.

Q3: How old is Roki Sasaki?
A3: Born on November 3, 2001, he is currently 23 years old (as of October 2025), turning 24 in November.

Q4: What jersey number does Roki Sasaki wear?
A4: In MLB with the Los Angeles Dodgers, he wears #11. In Japan / national team play, he has appeared under #14.

Q5: Has Roki Sasaki thrown a perfect game?
A5: Yes, on April 10, 2022, while playing for the Chiba Lotte Marines, he recorded a perfect game (no hits, no walks, no errors) vs. the Orix Buffaloes.

Q6: What is Sasaki’s pitching style or repertoire?
A6: He uses four main pitches: a fastball (often 100+ mph), splitter (his best off-speed pitch), curveball, and slider. He has excellent arm mechanics, command potential, and control.

Q7: What challenges does he face in MLB?
A7: Key challenges include adjusting to stronger MLB hitters, maintaining command and control, handling increased innings / workload, and staying healthy (injury risk).

10. Conclusion

Roki Sasaki is more than just a promising name — he already holds elite status in the global baseball community. Standing at 6’2″ (188 cm) and around 187 lbs, he combines physical stature with an advanced pitch mix and high upside. At 23 years old and now with his MLB debut behind him, the eyes of baseball fans and analysts are firmly on him.

His transition into MLB is still nascent, marked by flashes of brilliance and inevitable growing pains. Health and consistency will be major factors in how far he can go. But given his track record (including a perfect game in Japan and dominant strikeout performances), the ceiling is extraordinarily high.

Keep an eye on Sasaki — he may soon evolve from the “potential future ace” label to “one of the best in baseball.”