The Saints dominated the first quarter and entered halftime riding on a 17-3 lead. Tampa Bay scored two touchdowns in the fourth quarter, including a 77-yard kick return by Micheal Spurlock, to tie the game at 17. As time expired, Garrett Hartley attempted a 37-yard field goal that would have salvaged the game for the Saints, but the kick hooked left. In overtime, Tampa Bay won the coin toss, received the kickoff, and drove down the field to win the game with a field goal, for a final score of 20-17. With the disappointing loss, the Saints fell to 13-2, and appeared to be at risk of losing homefield advantage in the playoffs to the Vikings. However, the Vikings lost in overtime to the Chicago Bears in Week 16's Monday night game, and the Saints clinched the top seed in the NFC.

Based on the above article, answer a question. How many points did Tampa win by?
3