Giant Killing, airing right now, is a really excellent soccer anime. I also like
Major as a baseball anime, though over the course of six seasons it's had natural highs and lows. Not everyone is going to take up auto racing, but
Capeta is a very underrated racing anime from a few years back. There's also
Cross Game, whose virtues have been extolled beyond any further need on this board - but though it covers baseball I don't really think of it a sports anime. it's more about relationships - but nevertheless the best series of the past year or so in any genre.