If you can stretch the term 'sport' to include bowling, then my choice is League Bowling. Easy, simple, fun. Otherwise, Baseball Stars 2. BS2 was one of the last sports games where I felt I knew what the hell I was doing. Sports games now I always feel like, "Auuugh, I didn't want to pass to him!" or "which guy am I controlling?!" Like in a soccer game, I'll be closing on the guy with the ball...all of a sudden I'm somebody else running the wrong way.
I don't own any sports games, but I have good memories of the BS games in the arcade.