Seahawks. Lost the game on one bad play call, and they had no other chances.
The Spurs didn't lose game 6 on one play in the closing minutes. Make a free throw, defend better, grab a rebound, even maybe keep Duncan in the game. All could've changed the outcome of game 6. Plus they still could have won in overtime and, after all that they still had another chance to win in game 7. Allen's shot was not even a game winner, the Spurs still had a series lead going into overtime. They had their chances to win overtime or game 7 but failed. I say no excuses, no regrets.