People · Republic of Korea
Sung Siwoo (성시우)
3×3 · top 1.1% of 288,433 all-time · competing since September 2023 · 2023SIWO02
Sung Siwoo (성시우) has been competing for 3 years. His best event is the 3×3: a personal-best single of 6.74, set at Seoul Spring 2026, puts him in the top 1.1% of the 288,433 people who have ever been ranked in the event, and 70th in Republic of Korea. Until January 2011, no official 3×3 solve in the world had been that fast. Across 8 competitions since September 2023, he has put 200 official solves on the record across eight events. Solve to solve, his 3×3 times vary about 15% around a typical one; 79% of the 36,406 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 12.95 in September 2023 to 6.74, a 48% improvement. Sung has entered eight competitions, more competitions than 90% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Republic of Korea | |
|---|---|---|---|---|---|
| 3×3 | 6.74 | 8.63 | top 1.1% | 70 / 4,390 | |
| Pyraminx | 2.69 | 3.47 | top 2.7% | 55 / 1,294 | |
| Megaminx | 44.40 | 53.88 | top 2.9% | 21 / 526 | |
| Skewb | 2.93 | 6.77 | top 4.7% | 52 / 874 | |
| Clock | 5.78 | 7.34 | top 6.5% | 43 / 541 | |
| 2×2 | 2.34 | 3.14 | top 7.4% | 216 / 2,334 | |
| 3×3 one-handed | 17.59 | 19.63 | top 14.1% | 201 / 981 | |
| 4×4 | 50.39 | 54.44 | top 25.3% | 450 / 1,316 |
Percentile against all competitors ever ranked in each event, a fairer measure than raw rank, because the pools differ by a factor of ten.
The line so far
Best single per competition, 3×3. Faster is higher — the axis is the right way up.
The story so far
- 31 Mar 2024First sub-10 3×3: 9.51 at Welcome Back Hong Kong 2024.
- 30 Sep 2023First competition: Kent Autumn 2023. A 12.95 3×3 single to start from.
Competitions
- Seoul Spring 2026 · 22 Mar 2026 — 2 personal bests set
- HKRCU 20th Anniversary 2025 · 20 Sep 2025 — 1 personal best set
- Zhuhai Open 2025 · 15 Jun 2025 — 1 personal best set
- Shenzhen Open 2024 · 7 Dec 2024 — 1 personal best set
- Hong Kong Cube Day 2024 · 31 Aug 2024 — 2 personal bests set
- Guangzhou Special 2024 · 2 Jun 2024 — 2 personal bests set
- Welcome Back Hong Kong 2024 · 31 Mar 2024 — 2 personal bests set
- Kent Autumn 2023 · 30 Sep 2023
Reading this page: a single is one solve's time · an average is the middle three of five solves, best and worst discarded · a PB is a personal best · a DNF (did not finish) is an attempt with no valid result: a popped piece, an unsolved face, an over-limit memorisation · top X% compares against everyone ever ranked in that event, which is fairer than raw rank because event pools differ tenfold.
The circuit
The people whose scorecards keep turning up next to his.
- Yang Pin Xiu (楊品修) — met in 25 rounds, finished ahead twice
- Timothy Kong Wing Sum (江永琛) — met in 22 rounds, finished ahead twice
- Andy Mok Man Cheuk (莫文卓) — met in 21 rounds, never finished ahead
Next targets
- A sub-6 3×3 single — 1,419 people have one; it is 0.74 away.
- A sub-2 Pyraminx single — 1,497 people have one; it is 0.69 away.
Targets move as he improves.