Head to head
Calvin Nielson vs Jack Pfeifer
Two careers, 89 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.
Calvin Nielson (United States) and Jack Pfeifer (United States) have met in 89 rounds across 9 competitions since 2017. Counting every round where both finished with a result, Jack Pfeifer leads Calvin Nielson: 65 finishes in front to 23 and 1 tie.
On personal bests the split is just as plain: across 16 shared events, Jack Pfeifer holds the faster single in 13, Calvin Nielson in 3.
Personal bests, side by side
faster single in bold| Event | Calvin Nielson single | average | Jack Pfeifer single | average |
|---|---|---|---|---|
| 3×3 | 7.41 | 9.37 | 4.84 | 6.15 |
| 2×2 | 1.02 | 2.67 | 0.63 | 1.48 |
| 4×4 | 34.64 | 43.51 | 21.17 | 24.50 |
| 5×5 | 1:11.59 | 1:24.03 | 38.13 | 42.47 |
| 6×6 | 2:28.88 | 2:37.29 | 1:08.61 | 1:12.44 |
| 7×7 | 3:58.09 | 4:14.47 | 1:41.75 | 1:46.70 |
| 3×3 blindfolded | 1:23.60 | 3:12.71 | 29.52 | 37.46 |
| 3×3 Fewest Moves | 20 moves | 24.33 | 23 moves | 27.00 |
| 3×3 one-handed | 12.92 | 17.81 | 8.10 | 9.97 |
| Clock | 4.75 | 6.40 | 4.81 | 6.20 |
| Megaminx | 1:02.11 | 1:09.66 | 36.72 | 41.15 |
| Pyraminx | 2.97 | 5.38 | 1.59 | 2.66 |
| Skewb | 2.54 | 4.71 | 1.52 | 2.92 |
| Square-1 | 4.66 | 6.58 | 5.16 | 7.61 |
| 4×4 blindfolded | 13:19.00 | — | 6:47.82 | 7:57.64 |
| 3×3 Multi-Blind | 2 of 2 cubes · 9:12 | — | 8 of 9 cubes · 52:39 | — |
Year by year
every meeting, 89 rounds in allRecent meetings
newest first · averages where the round ranked on one, singles otherwise| Year | Competition | Event | Round | Calvin Nielson | Jack Pfeifer | ahead |
|---|---|---|---|---|---|---|
| 2026 | Rubik's WCA North American Championship 2026 | 2×2 | First round | 3.75 | 1.97 | Jack Pfeifer |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 | First round | 12.63 | 7.30 | Jack Pfeifer |
| 2026 | Rubik's WCA North American Championship 2026 | 3×3 one-handed | First round | 20.70 | 12.11 | Jack Pfeifer |
| 2026 | Rubik's WCA North American Championship 2026 | 4×4 | First round | 46.86 | 26.91 | Jack Pfeifer |
| 2026 | Rubik's WCA North American Championship 2026 | Pyraminx | First round | 8.29 | 4.51 | Jack Pfeifer |
| 2026 | Rubik's WCA North American Championship 2026 | Skewb | First round | 6.23 | 4.16 | Jack Pfeifer |
| 2026 | Rubik's WCA North American Championship 2026 | Square-1 | Second round | 7.23 | 8.49 | Calvin Nielson |
| 2026 | Rubik's WCA North American Championship 2026 | Square-1 | First round | 6.85 | 8.93 | Calvin Nielson |
| 2026 | FMC World 2026 | 3×3 Fewest Moves | Final | 24.33 | 30 moves | Calvin Nielson |
| 2026 | For the Love of FMC USA 2026 | 3×3 Fewest Moves | Final | 28.67 | 30 moves | Calvin Nielson |
| 2024 | Rubik's WCA North American Championship 2024 | 2×2 | Second round | 3.78 | 2.26 | Jack Pfeifer |
| 2024 | Rubik's WCA North American Championship 2024 | 2×2 | First round | 3.54 | 2.46 | Jack Pfeifer |
| 2024 | Rubik's WCA North American Championship 2024 | 3×3 | First round | 10.95 | 8.92 | Jack Pfeifer |
| 2024 | Rubik's WCA North American Championship 2024 | 3×3 | Second round | 12.20 | 8.11 | Jack Pfeifer |
Full careers: Calvin Nielson · Jack Pfeifer. 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.