| Position | D |
| Birth city | Trencin, undefined, SVK |
| Birth date | 1977-03-18 (49) |
| Height | 6'9'' |
| weight (lb) | 250 |
| Drafted | pick 4 round 3 by NYI in 1996 |
season | L | T. | GP | G | A | PTS | +/- | pim |
|---|---|---|---|---|---|---|---|---|
| 1997-98 | NHL | New York Islanders | 25 | 0 | 1 | 1 | 1 | 50 |
| 1998-99 | NHL | New York Islanders | 59 | 2 | 6 | 8 | -8 | 83 |
| 1999-00 | NHL | New York Islanders | 65 | 2 | 9 | 11 | -27 | 57 |
| 2000-01 | NHL | New York Islanders | 82 | 2 | 7 | 9 | -27 | 157 |
| 2001-02 | NHL | Ottawa Senators | 75 | 10 | 13 | 23 | 30 | 156 |
| 2002-03 | NHL | Ottawa Senators | 74 | 9 | 30 | 39 | 29 | 116 |
| 2003-04 | NHL | Ottawa Senators | 79 | 16 | 25 | 41 | 33 | 147 |
| 2005-06 | NHL | Ottawa Senators | 71 | 16 | 27 | 43 | 17 | 135 |
| 2006-07 | NHL | Boston Bruins | 80 | 11 | 32 | 43 | -21 | 100 |
| 2007-08 | NHL | Boston Bruins | 77 | 17 | 34 | 51 | 14 | 114 |
| 2008-09 | NHL | Boston Bruins | 80 | 19 | 31 | 50 | 23 | 95 |
| 2009-10 | NHL | Boston Bruins | 80 | 7 | 37 | 44 | 19 | 87 |
| 2010-11 | NHL | Boston Bruins | 81 | 14 | 30 | 44 | 33 | 88 |
| 2011-12 | NHL | Boston Bruins | 79 | 12 | 40 | 52 | 33 | 86 |
| 2012-13 | NHL | Boston Bruins | 48 | 7 | 12 | 19 | 14 | 70 |
| 2013-14 | NHL | Boston Bruins | 77 | 17 | 23 | 40 | 25 | 66 |
| 2014-15 | NHL | Boston Bruins | 63 | 8 | 12 | 20 | 0 | 42 |
| 2015-16 | NHL | Boston Bruins | 80 | 9 | 28 | 37 | 12 | 71 |
| 2016-17 | NHL | Boston Bruins | 75 | 10 | 19 | 29 | 18 | 59 |
| 2017-18 | NHL | Boston Bruins | 73 | 7 | 17 | 24 | 22 | 60 |
| 2018-19 | NHL | Boston Bruins | 62 | 5 | 9 | 14 | 22 | 57 |
| 2019-20 | NHL | Boston Bruins | 68 | 5 | 9 | 14 | 26 | 60 |
| 2020-21 | NHL | Washington Capitals | 55 | 2 | 8 | 10 | 5 | 44 |
| 2021-22 | NHL | New York Islanders | 72 | 2 | 12 | 14 | 8 | 85 |
| NHL Total | 1680 | 209 | 471 | 680 | 301 | 2085 | ||
season | L | T. | GP | G | A | PTS | +/- | pim |
|---|---|---|---|---|---|---|---|---|
| 2001-02 | NHL | Ottawa Senators | 10 | 0 | 1 | 1 | 4 | 12 |
| 2002-03 | NHL | Ottawa Senators | 18 | 1 | 6 | 7 | 3 | 14 |
| 2003-04 | NHL | Ottawa Senators | 7 | 1 | 1 | 2 | 3 | 8 |
| 2005-06 | NHL | Ottawa Senators | 10 | 1 | 3 | 4 | 0 | 23 |
| 2007-08 | NHL | Boston Bruins | 7 | 1 | 1 | 2 | -1 | 12 |
| 2008-09 | NHL | Boston Bruins | 11 | 1 | 3 | 4 | 1 | 12 |
| 2009-10 | NHL | Boston Bruins | 13 | 2 | 5 | 7 | 1 | 29 |
| 2010-11 | NHL | Boston Bruins | 24 | 2 | 7 | 9 | 16 | 34 |
| 2011-12 | NHL | Boston Bruins | 7 | 1 | 2 | 3 | -1 | 8 |
| 2012-13 | NHL | Boston Bruins | 22 | 3 | 12 | 15 | 7 | 20 |
| 2013-14 | NHL | Boston Bruins | 12 | 2 | 2 | 4 | 4 | 14 |
| 2016-17 | NHL | Boston Bruins | 6 | 0 | 1 | 1 | -3 | 2 |
| 2017-18 | NHL | Boston Bruins | 12 | 1 | 2 | 3 | 7 | 4 |
| 2018-19 | NHL | Boston Bruins | 23 | 2 | 4 | 6 | 11 | 16 |
| 2019-20 | NHL | Boston Bruins | 13 | 0 | 2 | 2 | -4 | 8 |
| 2020-21 | NHL | Washington Capitals | 5 | 0 | 0 | 0 | 1 | 2 |
| NHL Total | 200 | 18 | 52 | 70 | 49 | 218 | ||