
| 1994-95 | Svk-U18 | Trencin U18 | 30 | 22 | 22 | 44 | - | - | - | 113 |
| 1994-95 | Slovak-Jr. | Trencin Jr. | 2 | 0 | 0 | 0 | - | - | - | 0 |
| 1995-96 | Slovak-Jr. | Trencin Jr. | 22 | 1 | 13 | 14 | - | - | - | 80 |
| 1995-96 | Slovak-2 | Piestany | 10 | 1 | 3 | 4 | - | - | - | 10 |
| 1995-96 | CzRep-Jr. | Sparta Jr. | 15 | 1 | 2 | 3 | - | - | - | 42 |
| 1995-96 | CzRep | Sparta | 1 | 0 | 0 | 0 | - | - | - | 0 |
| 1996-97 | WHL | Prince George | 49 | 3 | 19 | 22 | - | - | - | 120 |
| 1997-98 | NHL | New York Islanders | 25 | 0 | 1 | 1 | 1 | 10 | 0.0% | 50 |
| 1997-98 | AHL | Kentucky | 48 | 4 | 9 | 13 | 0 | 64 | 6.3% | 125 |
| 1998-99 | NHL | New York Islanders | 59 | 2 | 6 | 8 | -8 | 56 | 3.6% | 83 |
| 1998-99 | AHL | Lowell | 23 | 2 | 2 | 4 | 5 | 38 | 5.3% | 47 |
| 1999-00 | NHL | New York Islanders | 65 | 2 | 9 | 11 | -27 | 47 | 4.3% | 57 |
| 2000-01 | NHL | New York Islanders | 82 | 2 | 7 | 9 | -27 | 83 | 2.4% | 157 |
| 2001-02 | NHL | Ottawa Senators | 75 | 10 | 13 | 23 | 30 | 105 | 9.5% | 156 |
| 2001-02 | Slovakia | Trencin | 8 | 2 | 2 | 4 | - | - | - | 32 |
| 2002-03 | NHL | Ottawa Senators | 74 | 9 | 30 | 39 | 29 | 168 | 5.4% | 116 |
| 2003-04 | NHL | Ottawa Senators | 79 | 16 | 25 | 41 | 33 | 185 | 8.6% | 147 |
| 2004-05 | Sweden | Farjestad | 33 | 10 | 15 | 25 | - | - | - | 132 |
| 2005-06 | NHL | Ottawa Senators | 71 | 16 | 27 | 43 | 17 | 212 | 7.6% | 135 |
| 2006-07 | NHL | Boston Bruins | 80 | 11 | 32 | 43 | -21 | 204 | 5.4% | 100 |
| 2007-08 | NHL | Boston Bruins | 77 | 17 | 34 | 51 | 14 | 207 | 8.2% | 114 |
| 2008-09 | NHL | Boston Bruins | 80 | 19 | 31 | 50 | 23 | 216 | 8.8% | 95 |
| 2009-10 | NHL | Boston Bruins | 80 | 7 | 37 | 44 | 19 | 242 | 2.9% | 87 |
| 2010-11 | NHL | Boston Bruins | 81 | 14 | 30 | 44 | 33 | 264 | 5.3% | 88 |
| 2011-12 | NHL | Boston Bruins | 79 | 12 | 40 | 52 | 33 | 224 | 5.4% | 86 |
| 2012-13 | NHL | Boston Bruins | 48 | 7 | 12 | 19 | 14 | 119 | 5.9% | 70 |
| 2012-13 | KHL | Lev Praha | 25 | 4 | 6 | 10 | - | - | - | 24 |
| 2013-14 | NHL | Boston Bruins | 77 | 17 | 23 | 40 | 25 | 168 | 10.1% | 66 |
| 2014-15 | NHL | Boston Bruins | 63 | 8 | 12 | 20 | 0 | 138 | 5.8% | 42 |
| 2015-16 | NHL | Boston Bruins | 80 | 9 | 28 | 37 | 12 | 158 | 5.7% | 71 |
| 2016-17 | NHL | Boston Bruins | 75 | 10 | 19 | 29 | 18 | 136 | 7.4% | 59 |
| 2016-17 | WCup | Team Europe | 6 | 2 | 0 | 2 | 0 | - | - | 6 |
| 2017-18 | NHL | Boston Bruins | 73 | 7 | 17 | 24 | 22 | 144 | 4.9% | 60 |
| 2018-19 | NHL | Boston Bruins | 62 | 5 | 9 | 14 | 22 | 99 | 5.1% | 57 |
| 2019-20 | NHL | Boston Bruins | 68 | 5 | 9 | 14 | 26 | 86 | 5.8% | 60 |
| 2020-21 | NHL | Washington Capitals | 55 | 2 | 8 | 10 | 5 | 67 | 3.0% | 44 |
| 2021-22 | NHL | New York Islanders | 72 | 2 | 12 | 14 | 8 | 81 | 2.5% | 85 |
| NHL Totals | – | 1680 | 209 | 471 | 680 | 301 | 3419 | 6.1% | 2085 | |
| AHL Totals | – | 71 | 6 | 11 | 17 | 5 | 102 | 5.9% | 172 | |
| Juniors Totals | – | 49 | 3 | 19 | 22 | - | - | - | 120 | |
| 1996-97 | WHL | Prince George | 15 | 1 | 7 | 8 | - | - | - | 45 |
| 1997-98 | AHL | Kentucky | 1 | 0 | 0 | 0 | - | - | - | 4 |
| 2001-02 | NHL | Ottawa Senators | 10 | 0 | 1 | 1 | 4 | 17 | 0.0% | 12 |
| 2002-03 | NHL | Ottawa Senators | 18 | 1 | 6 | 7 | 3 | 32 | 3.1% | 14 |
| 2003-04 | NHL | Ottawa Senators | 7 | 1 | 1 | 2 | 3 | 12 | 8.3% | 8 |
| 2004-05 | Sweden | Farjestad | 13 | 3 | 5 | 8 | - | - | - | 82 |
| 2005-06 | NHL | Ottawa Senators | 10 | 1 | 3 | 4 | 0 | 17 | 5.9% | 23 |
| 2007-08 | NHL | Boston Bruins | 7 | 1 | 1 | 2 | -1 | 14 | 7.1% | 12 |
| 2008-09 | NHL | Boston Bruins | 11 | 1 | 3 | 4 | 1 | 28 | 3.6% | 12 |
| 2009-10 | NHL | Boston Bruins | 13 | 2 | 5 | 7 | 1 | 34 | 5.9% | 29 |
| 2010-11 | NHL | Boston Bruins | 24 | 2 | 7 | 9 | 16 | 62 | 3.2% | 34 |
| 2011-12 | NHL | Boston Bruins | 7 | 1 | 2 | 3 | -1 | 21 | 4.8% | 8 |
| 2012-13 | NHL | Boston Bruins | 22 | 3 | 12 | 15 | 7 | 55 | 5.5% | 20 |
| 2013-14 | NHL | Boston Bruins | 12 | 2 | 2 | 4 | 4 | 22 | 9.1% | 14 |
| 2016-17 | NHL | Boston Bruins | 6 | 0 | 1 | 1 | -3 | 8 | 0.0% | 2 |
| 2017-18 | NHL | Boston Bruins | 12 | 1 | 2 | 3 | 7 | 26 | 3.9% | 4 |
| 2018-19 | NHL | Boston Bruins | 23 | 2 | 4 | 6 | 11 | 21 | 9.5% | 16 |
| 2019-20 | NHL | Boston Bruins | 13 | 0 | 2 | 2 | -4 | 13 | 0.0% | 8 |
| 2020-21 | NHL | Washington Capitals | 5 | 0 | 0 | 0 | 1 | 5 | 0.0% | 2 |
| NHL Totals | – | 200 | 18 | 52 | 70 | 49 | 387 | 4.7% | 218 | |
| AHL Totals | – | 1 | 0 | 0 | 0 | - | - | - | 4 | |
| Juniors Totals | – | 15 | 1 | 7 | 8 | - | - | - | 45 | |
| Season | Opponent | Date | G | A | P | +/- | PIM | PPG | SHG | S | Shifts | TOI |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Regular | vs TBL | Apr 29 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 2 | 26 | 19:24 |
| Regular | vs WSH | Apr 28 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 27 | 20:58 |
| Regular | vs CAR | Apr 24 | 0 | 0 | 0 | -2 | 2 | 0 | 0 | 0 | 22 | 18:05 |
| Regular | @ BUF | Apr 23 | 0 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 23 | 20:27 |
| Regular | vs NYR | Apr 21 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 24 | 20:47 |
| Year | Award |
|---|---|
| 2010-11 | Stanley Cup |
| 2008-09 | James Norris Memorial Trophy |
| 2010-11 | Mark Messier NHL Leadership Award |