Piazza, Jon
Current rating: 1295
Record: 9-24
| Grand Prix Montreal 2019 (ELD limited) | starting rating: 1323 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 191 | Bilodeau, Jean-Francois (1500) | Lost 0-2 | -151308 |
| 2sealed | 383 | Robert, Mathieu (1585) | Lost 0-2 | -131295 |
| top | average opponent: 1543record: 0-2 | new rating: 1295 | ||
| Grand Prix Montreal 2018 (GRN limited) | starting rating: 1325 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 238 | Burrows-Johnson, Andrew (1604) | Lost 0-2 | -131312 |
| 2sealed | 310 | Boulay, Gabriel (1482) | Won 2-0 | +211333 |
| 3sealed | 411 | Bourdon, Philip (1451) | Won 2-1 | +201353 |
| 4sealed | 289 | Mermet, Olivier (1477) | Lost 0-2 | -161337 |
| 5sealed | 277 | Oake, Brandon (1526) | Lost 0-2 | -141323 |
| top | average opponent: 1508record: 2-3 | new rating: 1323 | ||
| Grand Prix Toronto 2017 (HOU limited) | starting rating: 1371 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 239 | Schambier, Simon (1539) | Lost 0-2 | -151356 |
| 2sealed | 339 | Michael, Nicholas (1464) | Lost 1-2 | -161340 |
| 3sealed | 589 | Madden, Ryan (1479) | Lost 0-2 | -151325 |
| top | average opponent: 1494record: 0-3 | new rating: 1325 | ||
| Grand Prix Montreal 2016 (EMN limited) | starting rating: 1419 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2280 | Bon-Miller, Alex (1456) | Lost 1-2 | -181401 |
| 2sealed | 2498 | Surprenant, Maxime (1482) | Won 2-0 | +201421 |
| 3sealed | 2378 | Nguyen, Joseph (1464) | Lost 0-0 | -171404 |
| 4sealed | 2479 | Lyrette, Styve (1520) | Lost 0-2 | -161388 |
| 5sealed | 2481 | Solonynko, Ryan (1469) | Lost 1-2 | -171371 |
| top | average opponent: 1478record: 1-4 | new rating: 1371 | ||
| Grand Prix Montreal 2015 (DTK limited) | starting rating: 1408 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 290 | Henderson, David (1464) | Won 2-1 | +191427 |
| 2sealed | 3 | Forget, Alexandre (1467) | Lost 0-2 | -171410 |
| 3sealed | 328 | Brunet, Martin (1482) | Lost 0-2 | -171393 |
| 4sealed | 484 | Tsoller, Michael (1529) | Won 2-0 | +211414 |
| 5sealed | 372 | Pezzati, Gram (1499) | Won 2-0 | +191433 |
| 6sealed | 296 | Ledvinka, David (1633) | Lost 1-2 | -141419 |
| top | average opponent: 1513record: 3-3 | new rating: 1419 | ||
| Grand Prix Montreal 2014 (BNG limited) | starting rating: 1453 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 95 | Patelakis, Steve (1558) | Lost 1-2 | -161437 |
| 3sealed | 568 | Hopkins, Michael (1792) | Lost 0-2 | -121425 |
| 4sealed | 485 | Leclair, Jonathan (1482) | Lost 0-2 | -171408 |
| top | average opponent: 1611record: 0-3 | new rating: 1408 | ||
| Grand Prix Toronto 2013 (THS limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 147 | Young, Devin (1500) | Lost 0-2 | -171446 |
| 2sealed | 619 | Lawrence, Chris (1499) | Won 2-0 | +191465 |
| 3sealed | 447 | Aiken, Simone (1576) | Lost 1-2 | -161449 |
| 4sealed | 509 | Kerr, Tomo R (1469) | Won 2-0 | +181467 |
| 5sealed | 417 | Schneider, Oliver (1663) | Lost 0-2 | -141453 |
| top | average opponent: 1541record: 2-3 | new rating: 1453 | ||
| Grand Prix Montreal 2011 (M12 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 512 | Lee, John 2 (1484) | Lost 0-2 | -181482 |
| 2sealed | 551 | Fernandes, Paulo (1462) | Lost 0-2 | -191463 |
| 3sealed | 564 | Stoykovich, Rachel (1464) | Won 2-1 | +181481 |
| 4sealed | 532 | Ifill, Chris (1482) | Lost 0-2 | -181463 |
| top | average opponent: 1473record: 1-3 | new rating: 1463 | ||