USE MORE MINDGAMES. All you did was run directly at him, or directly away from him for the duration of the match, as far as teching concerned, it was pretty obvious teching, as well. Far too aggressive, and far too much carelessness in your play style. I saw times where you would boomerang, then jump directly on top of Marth (Er?) and pull a bomb. If he had simply shielded, powershielded, jumped, or spotdodged the boomerang, you would've eaten a nice fsmash, or fair abuse. You're too reliant on the up+b kill, which is something that all newer Links have to overcome (REMEMBER THIS ONE, MOST OF ALL). Learn to smash/double stick DI directly up and toward the stage from all horizontal kill attempts, and it gives you a more open feel of getting back onto the stage.
The Marth doesn't look comfortable at all wavedashing, but tried to emulate it into his play, and it messed him up. He also has issues with comboing Link, which is something that Marth should have second-nature whenever he does manage to get an approach in. It also seemed that the Marth relied a little too heavily on utilt spam.
Both of you need to work on sweetspotting, and mixing up your recoveries. Both of you need to not rely on inherent attack-from-the-stage option, but drop slightly, double jump onto the stage, into an aerial. Both of you need to work on DI, you were both killed much faster than you had to be.
I'll enjoy watching your Link grow. :O