Head to head
Simon Kellum vs Michael Nielsen
Two careers, 112 shared rounds, one running count. Everything below comes from the official results the two of them posted in the same rounds of the same competitions.
Simon Kellum (United States) and Michael Nielsen (United States) have met in 112 rounds across 8 competitions since 2019. Counting every round where both finished with a result, Michael Nielsen leads Simon Kellum: 70 finishes in front to 42.
On personal bests the split is just as plain: across 13 shared events, Simon Kellum holds the faster single in 11, Michael Nielsen in 2.
Personal bests, side by side
faster single in bold| Event | Simon Kellum single | average | Michael Nielsen single | average |
|---|---|---|---|---|
| 3×3 | 4.91 | 7.06 | 4.96 | 6.21 |
| 2×2 | 0.71 | 1.44 | 0.77 | 1.37 |
| 4×4 | 29.24 | 35.27 | 25.58 | 29.10 |
| 5×5 | 55.69 | 1:04.66 | 53.84 | 59.50 |
| 6×6 | 1:53.03 | 2:06.17 | 1:53.47 | 2:10.50 |
| 7×7 | 2:57.72 | 3:15.06 | 3:32.52 | 3:36.41 |
| 3×3 Fewest Moves | 19 moves | 20.67 | 29 moves | 33.00 |
| 3×3 one-handed | 8.49 | 11.90 | 9.71 | 13.45 |
| Clock | 4.00 | 4.88 | 6.91 | 8.28 |
| Megaminx | 39.37 | 45.94 | 52.77 | 58.55 |
| Pyraminx | 0.73 | 1.53 | 0.98 | 1.41 |
| Skewb | 0.85 | 1.71 | 1.27 | 2.47 |
| Square-1 | 6.65 | 10.13 | 6.78 | 10.69 |
Year by year
every meeting, 112 rounds in allRecent meetings
newest first · averages where the round ranked on one, singles otherwise| Year | Competition | Event | Round | Simon Kellum | Michael Nielsen | ahead |
|---|---|---|---|---|---|---|
| 2026 | Rubik's WCA North American Championship 2026 | 2×2 | Second round | 2.65 | 1.40 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | 2×2 | First round | 2.36 | 1.69 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 | Second round | 7.60 | 8.43 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 | First round | 8.63 | 6.38 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | 4×4 | First round | 36.71 | 30.16 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | Pyraminx | First round | 2.10 | 1.82 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | Pyraminx | Final | 2.65 | 1.97 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | Pyraminx | Second round | 2.14 | 1.88 | Michael Nielsen |
| 2026 | Rubik's WCA North American Championship 2026 | Skewb | Second round | 2.62 | 3.15 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | Skewb | First round | 2.89 | 3.31 | Simon Kellum |
| 2025 | Rubik's x TheCubicle CubingUSA All-Stars 2025 | Pyraminx | First round | 2.55 | 2.36 | Michael Nielsen |
| 2025 | Rubik's x TheCubicle CubingUSA All-Stars 2025 | Pyraminx | Final | 2.16 | 1.65 | Michael Nielsen |
| 2025 | Rubik's x TheCubicle CubingUSA All-Stars 2025 | Skewb | First round | 2.76 | 4.47 | Simon Kellum |
| 2025 | Rubik's WCA World Championship 2025 | 2×2 | First round | 2.95 | 1.76 | Michael Nielsen |
Full careers: Simon Kellum · Michael Nielsen. A meeting is a round of one event at one competition where both finished with a counted result. Who finished ahead follows official placing in the round: rounds played to an average are won on the average, best-of rounds on the single.