| Tournament | Round | Cheah Siu Hean | Chris May |
| 21.04.2003 Australian Championships (SA) | 11 | 477 | 337 |
| 28.03.2005 Australian Championships (TAS) | 8 | 528 | 412 |
| 29.11.2006 Warm-up Beta (NSW) | 9 | 329 | 543 |
| 09.04.2007 Australian Championships (NSW) | 14 | 478 | 387 |
| 24.03.2008 Australian Championship (VIC) | 11 | 540 | 292 |
| 24.03.2008 Australian Championship (VIC) | 14 | 418 | 467 |
| 25.04.2011 Aus Championship (ACT) | 18 | 338 | 408 |
| 09.04.2012 Australian Championship (TAS) | 4 | 466 | 450 |
| 09.04.2012 Australian Championship (TAS) | 20 | 416 | 416 |
| 01.04.2013 Australian Championship (QLD) | 11 | 452 | 425 |
| 21.04.2014 Australian Championship (NSW) | 18 | 504 | 330 |
| Head-to-head after 11 games | 7.5 | 3.5 | |
| Average score | 449.63 | 406.09 | |
| Spread: | 479 | -479 | |