Well, depends on the sport. If you're doing running, probably a lot of flash backs to training, and a lot mental screaming at the top of your lungs about something cheesy, like not being able to disappoint your friends.
For something like soccer? Little details matter. Now, that isn't to say you should write every second, but you should definitely fill out the important ones, at least. You can kinda fill all the boring stuff in with just a few quick sentences. But people need to feel the tension, that moment a defender caught the character completely off guard, the moment the main character had a breakthrough, and just tore the enemy team apart. The moment they felt completely crushed by a simple play they didn't see coming, everything matters.
And then you get sports that can be considered boring... well, I really don't have any tips for those ones, other than make them some sort of super version of the sport to keep people interested. Maybe they play golf by hitting the ball into a course that hovers in the air, and the ball ricochets off everything with a ton of force. Or maybe you're just a genius who can write interesting golf without any sort of visuals.