Guevara, Mark
Current rating: 1463
Record: 6-9
| Grand Prix Singapore 2015 (modern) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 102 | Ong, Calvin Xuan Qiang (1594) | Lost 1-2 | -161447 |
| 4modern | 188 | Yamagami, Yudai (1743) | Won 2-0 | +231470 |
| 5modern | 180 | Lee, Rick Hup Beng (1776) | Lost 0-2 | -121458 |
| 6modern | 236 | Xiao, Han (1518) | Lost 1-2 | -171441 |
| 7modern | 316 | Giri, Devinn Shaun (1478) | Won 2-0 | +181459 |
| 8modern | 248 | Lim, Ming'en Samuel (1513) | Won 2-1 | +191478 |
| 9modern | 188 | Supapipat, Nattawin (1620) | Lost 1-2 | -151463 |
| average opponent: 1606record: 3-4 | new rating: 1463 | |||
| Grand Prix Singapore 2009 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 61 | Yu, Chun Cheung (1500) | Lost 1-2 | -181482 |
| 2extended | 111 | Poh, Ming Jie Audric (1431) | Lost 1-2 | -191463 |
| 3extended | 142 | Shi, Zhenhao (1446) | Lost 1-2 | -181445 |
| 4extended | 173 | Koh, Chien Shen (1411) | Won 2-1 | +171462 |
| 5extended | 162 | Chia, Bing Hong (1491) | Lost 0-2 | -171445 |
| 6extended | 151 | Yee, Chin Keng (1435) | Won 2-0 | +181463 |
| 7extended | 128 | Jacob, Scott (1464) | Lost 1-2 | -181445 |
| 8extended | 114 | Hong, tian yuan (1448) | Won 2-0 | +181463 |
| average opponent: 1453record: 3-5 | new rating: 1463 | |||