Finally ! That match should have ended at the very least 10 chapters ago Xx
And glad he actually lost. Probably the most surprising thing out there. Winning the nationals with that little tennis experience was a ludicrous goal to begin with. Him going this far is already an incredible feat to begin with.
Now I hope he'll actually stick to his promise, but I dunno... Unless the manga is stopping soon or it switch gear for maruo going to play tennis in college, I suspect he's going to somehow bullshit his way back to the path of a pro...