Head to head
Mason Langenderfer vs Simon Kellum
Two careers, 317 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.
Mason Langenderfer (United States) and Simon Kellum (United States) have met in 317 rounds across 25 competitions since 2017. Counting every round where both finished with a result, Simon Kellum leads Mason Langenderfer: 217 finishes in front to 97 and 3 ties.
On personal bests the split is just as plain: across 17 shared events, Simon Kellum holds the faster single in 11, Mason Langenderfer in 6.
Personal bests, side by side
faster single in bold| Event | Mason Langenderfer single | average | Simon Kellum single | average |
|---|---|---|---|---|
| 3×3 | 6.34 | 8.32 | 4.91 | 7.06 |
| 2×2 | 0.85 | 2.05 | 0.71 | 1.44 |
| 4×4 | 28.90 | 32.31 | 29.24 | 35.27 |
| 5×5 | 57.54 | 1:05.85 | 55.69 | 1:04.66 |
| 6×6 | 1:55.39 | 2:05.68 | 1:53.03 | 2:06.17 |
| 7×7 | 3:10.51 | 3:19.13 | 2:57.72 | 3:15.06 |
| 3×3 blindfolded | 17.30 | 24.69 | 39.08 | 1:02.97 |
| 3×3 Fewest Moves | 23 moves | 29.67 | 19 moves | 20.67 |
| 3×3 one-handed | 8.35 | 11.64 | 8.49 | 11.90 |
| Clock | 5.65 | 6.83 | 4.00 | 4.88 |
| Megaminx | 49.63 | 55.35 | 39.37 | 45.94 |
| Pyraminx | 2.30 | 3.40 | 0.73 | 1.53 |
| Skewb | 1.08 | 2.62 | 0.85 | 1.71 |
| Square-1 | 9.64 | 14.13 | 6.65 | 10.13 |
| 4×4 blindfolded | 2:12.40 | 2:47.76 | 7:34.34 | — |
| 5×5 blindfolded | 5:39.93 | 11:01.00 | 19:52.00 | — |
| 3×3 Multi-Blind | 28 of 31 cubes · 52:02 | — | 10 of 12 cubes · 56:45 | — |
Year by year
every meeting, 317 rounds in allRecent meetings
newest first · averages where the round ranked on one, singles otherwise| Year | Competition | Event | Round | Mason Langenderfer | Simon Kellum | ahead |
|---|---|---|---|---|---|---|
| 2026 | Rubik's WCA North American Championship 2026 | 2×2 | First round | 3.43 | 2.36 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 | First round | 9.73 | 8.63 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 | Second round | 9.30 | 7.60 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 blindfolded | Second round | 23.39 | 1:27.86 | Mason Langenderfer |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 blindfolded | First round | 29.32 | 1:05.08 | Mason Langenderfer |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 one-handed | Second round | 14.76 | 16.76 | Mason Langenderfer |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 one-handed | First round | 14.44 | 12.94 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | 4×4 | First round | 36.69 | 36.71 | Mason Langenderfer |
| 2026 | Rubik's WCA North American Championship 2026 | 5×5 | First round | 1:09.97 | 1:10.10 | Mason Langenderfer |
| 2026 | Rubik's WCA North American Championship 2026 | Pyraminx | First round | 7.94 | 2.10 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | Skewb | Second round | 3.71 | 2.62 | Simon Kellum |
| 2026 | Rubik's WCA North American Championship 2026 | Skewb | First round | 4.60 | 2.89 | Simon Kellum |
| 2026 | CubingUSA Great Lakes Championship 2026 | 2×2 | Second round | 3.36 | 3.16 | Simon Kellum |
| 2026 | CubingUSA Great Lakes Championship 2026 | 2×2 | First round | 2.88 | 2.12 | Simon Kellum |
Full careers: Mason Langenderfer · Simon Kellum. 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.