| Year | Team | G | GS | MPG | FG% | 3P% | FT% | OFF | DEF | RPG | APG | SPG | BPG | TO | PF | PPG |
| 2004-05 | Celtics | 39 | 7 | 13.0 | .426 | .358 | .704 | 0.4 | 1.3 | 1.7 | 1.4 | 0.5 | 0.2 | 0.6 | 1.8 | 4.5 |
| 2005-06 | Celtics | 71 | 71 | 34.1 | .487 | .385 | .851 | 0.8 | 3.3 | 4.1 | 4.6 | 1.2 | 0.6 | 1.9 | 2.8 | 11.8 |
| 2006-07 | Celtics | 69 | 47 | 32.1 | .427 | .365 | .853 | 0.5 | 2.6 | 3.0 | 4.4 | 1.1 | 0.5 | 2.0 | 2.2 | 12.2 |
| 2007-08 | Cavaliers | 26 | 31 | 31.0 | .440 | .367 | .788 | 0.7 | 3.0 | 3.7 | 4.5 | 1.1 | 0.7 | 2.0 | 2.3 | 10.3 |
| 2007-08 | SuperSonics | 35 | 31 | 20.7 | .388 | .339 | .667 | 0.4 | 2.4 | 2.7 | 3.2 | 0.9 | 0.3 | 1.9 | 1.3 | 6.8 |
| 2008-09 | Cavaliers | 64 | 64 | 33.7 | .457 | .399 | .833 | 0.5 | 2.7 | 3.2 | 3.5 | 1.5 | 0.2 | 1.4 | 2.0 | 11.7 |
| 2009-10 | Cavaliers | 60 | 3 | 25.0 | .445 | .325 | .810 | 0.5 | 2.3 | 2.8 | 3.3 | 0.9 | 0.5 | 1.5 | 1.4 | 8.8 |
| 2010-11 | Celtics | 24 | 2 | 18.9 | .458 | .364 | .867 | 0.3 | 1.3 | 1.5 | 2.7 | 0.8 | 0.4 | 1.3 | 1.2 | 5.6 |
| 2011-12 | Mavericks | 44 | 27 | 24.1 | .461 | .355 | .886 | 0.3 | 2.0 | 2.3 | 3.2 | 1.3 | 0.3 | 1.7 | 1.5 | 9.6 |
| Totals: | 432 | 283 | 27.4 | .448 | .372 | .826 | 0.5 | 2.4 | 2.9 | 3.6 | 1.1 | 0.4 | 702 | 828 | 9.7 | |