Here's some tips from someone who had a pretty successful sports blog like 5 years back:
1) Someone said it earlier, but a Top 10, Top 5 anything. Comedy kills it though!
2) Do a post of other sports blogger posts for that day. That means going around to the different blogs (big and medium), and link to you favorite story of the day. Believe me, the medium guys and gals will see the traffic, and will start linking to yours eventually.
3) Take some time to write a really funny post. You don't even have to write something. Maybe like Top 10 Funny Basketball photos. Submit it to Sports Illustrated Hot Clicks.
4) Write about everything and anything. Harvin was traded? Be the first to write about it. And definitely make sure you have some SEO Title Tag and Description plugin. You will see traffic.
5) Try to get at least 3-4 articles a day. Some don't even have to be real articles, but something newsworthy. It also helps to write a bunch of different articles, and save it in the queue.
6) There will be times you will get burnt out. When that comes, work on something else. Maybe increase your twitter followers. It's also a great way to see how other sports bloggers are interacting with the world.
Things take time, but you everyone starts from nothing.