If you want to look at things like that, then you can also say that the Lakers have beaten the Spurs in the playoffs in the last two years, winning in 4 games back in 2001 and in 5 games in 2002. This "implies" that they'll win in 6 games this year. If things always worked out like this, then they wouldn't even play. But that's not how it always works out. The Lakers were tied at 2-2 against Sacramento last year, and they managed to win game 6 at home and game 7 on the road. I guess that's why they play the games.