I'll try even though I don't play either of the characters, just some general stuff and things I see people that beat me do (btw this is the first link, I don't have enough time to watch all of them right now.)
Marth:
- you look like you still need a little bit of work on the l-cancel. There were times that you came down and put up your shield for a brief moment. Either let go of the l button a little faster, our use a WD out of the shield to quickly slide away.
-Nair is cool, just like most in the game are (pichu's FTW, lol), BUT you seem to be using it a bit too much on approach. Your fair has much more potential as a combo move. Try to think of nair as more of a spacing move or a combo finisher. Start slow with the comboing and see what works and when it works. Heck, even a tippered SHFFL'ed fair can lead to a simple tippered nair to send the opponent flying.
-be careful when off the ledge (such as your SD at about :43, and right at the start of link's last stock). That cost you a lot of valuable percentage.
-Work on your spacing a bit. Tippers, tippers, tippers, tippers, till your opponent has nightmares about them. Also make sure to abuse your range, it eats people for breakfast, lunch, dinner, desert, and postmortem snacks.
-Try to abuse marth's grab more. it has a huge range, and his grab game is decent.
-Work on your edgeguarding, Marth's edgeguarding game is tremendous. If you see a grapple shot coming, try dropping down, doing a rising bair to swat link away, then up+b back. The timing could take some getting used to, but the extra option is wel worth it. Other opportunities: dtilt, dair (try to stay above the ledge and make your disjointed hitbox cut through the level and bit beneath the edge), ftilt, edgehog, situational counter
-I'd say make more liberal use of his tilts when possible. ftilt is great and utilt is nifty (though definitely better on a stage with platforms)
-If your oppponent uses their second jump for whatever reason in the air, try a uair juggle. If they attempt a predictable dair to get out of it, use counter or shieldgrab.
-you could stand to WD more.
-you didn't do it a lot, which makes me happy, but avoid using fsmash to build up damage. Try to only use it as an edgeguard, finish them at high percents, or knock them off when their near the edge to try and set up edgeguards for low percent kills.
-in general, beware link's up+b
Link:
- you did well, but you could stand to use a few more projectiles.
- when Marth gets too agressive with aerial approaches, make him pay. Shieldgrab him, or WD back to grab/smash/projectile/etc. I don't know much about link's grab game, but if there's bad DI, a dthrow to utilt to whatever will probably work.
- you edgeguarded well. There might be something I'm missing because I don't play link, but I thought you did a nice job here.
- make sure you don't miss l-cancels, especially dair (though you did a good job with this overall too)
- I liked how you didn't really push link to be faster than he was meant to. A lot of people do that, don't get results, and wind up wondering what happened.
- hawt ledgetech at 0:53, i wasn't expecting to see that based on what I initially saw at the start.
- Personally, I think you should utilize nair more rather than the fair, though that may just be personal preference on my part.
- Good job overcoming the tier margin
Always nice to see low tiers win.
On the overall, you guys aren't too bad, but can use a bit of work. I hate to use such a broad, general term, but try working on 'mindgaming more'. There were a few times where I was able to predict what both of you were going to do at the same time. Do your best not to fall into patterns and keep things fresh. You show some potential though