the series 4–2. June 17 – The Celtics lost to the Los Angeles Lakers 83–79 in Game 7 of the NBA Finals and failed to capture their 18th NBA Championship. Summary NBA Draft 2009 Free agency Draft picks Roster Pre-season |- align="center" bgcolor="#ffbbbb" | 1 || October 7 || @ Houston Rockets || 90–96 || || || || 6,300(Hidalgo, Texas) || 0–1 recap |- align="center" bgcolor="#ccffcc" | 2 || October 9 || New York Knicks || 82–96 || || || || 18,624 || 1–1 recap |- align="center" bgcolor="#ccffcc" | 3 || October 11 || Brooklyn Nets || 93–100 || || || || 18,624 || 2–1 recap |- align="center" bgcolor="#ccffcc" | 4 || October 13 || @Brooklyn Nets || 91–88 || || || || 12,790(Newark, New Jersey) || 3–1 recap |- align="center" bgcolor="#ccffcc" | 5 || October 14 || Toronto Raptors || 90–106 || || || || 10,117(Hartford, Connecticut) || 4–1 recap |- align="center" bgcolor="#ccffcc" | 6 || October 18 || @Toronto Raptors || 101–82 || || || || 13,607 || 5–1 recap |- align="center" bgcolor="#ffbbbb" | 7 || October 20 || @New York Knicks || 103–108 || || || || 18,792 || 5–2 recap |- align="center" bgcolor="#ccffcc" | 8 || October 21 || @Cleveland Cavaliers || 96–82 || || || || 18,021(Columbus, Ohio) || 6–2 recap |- Regular season Standings Record vs. opponents Game log |- bgcolor="#bbffbb" | 1 | October 27 | @ Cleveland | | Paul Pierce (23) | Paul Pierce (11) | Rajon Rondo (10) | Quicken Loans Arena20,562 | 1–0 |- bgcolor="#bbffbb" | 2 | October 28 | New Orleans | | Ray Allen (18) | Shelden Williams (9) | Rajon Rondo (11) | TD Garden18,624 | 2–0 |- bgcolor="#bbffbb" | 3 | October 30 | Chicago | | Paul Pierce (22) | Shelden Williams (10) | Rajon Rondo (16) | TD Garden18,624 | 3–0 |- bgcolor="#bbffbb" | 4 | November 1 | New Orleans | | Paul Pierce (27) | Kevin Garnett, Kendrick Perkins (7) | Rajon Rondo (10) | TD Garden 18,624 | 4–0 |- bgcolor="#bbffbb" | 5 | November 3 | @ Philadelphia | | Paul Pierce (21) | Paul Pierce (8) | Rajon Rondo (5) | Wachovia Center 11,251 | 5–0 |- bgcolor="#bbffbb" | 6 | November 4 | @ Minnesota | | Rajon Rondo (18) | Kevin Garnett (11) | Rajon Rondo (6) | Target Center 19,133 | 6–0 |- bgcolor="#ffcccc"