For the first match, I'll say that you should try to incorporate the Dtilt into your edgeguarding. One of the KOs you tried to get with the Fsmash would have been a kill if you hit with the tilt. Other than that, try to incorporate a bit of approaching to backward wavedashing to either bait out a Fsmash or some other move, for a following wavedash to grab or Fsmash. Of course, that's just advice for baiting a Marth into smashing, but it's still nice to practice. As many might simply do the A slash(es) to counter the approach, you can use it for when they don't. It's all about circumstance.
Your first death was due to mistiming. Practice your edge slashing. Your opponent could have been killed on his third life when you strike him off the left side if you had wavedashed into an Fsmash. That's something to work on.
Finally, good spacing throughout, and excellent final kill.
Second match. I'm not sure if that second life suicide was from an attempted wavedash that went wrong, but try not to do it to often. (speaking jokingly) Also, against Peach, try to follow up your forward throws at low percent with another running throw forward, and if they DI away, wavedash and Tipper. This is handy when she is at higher percents.
To close, you used your air game well to keep Peach unable to attack you on the ground. Especially since the player hardly used Turnips. Their mistake.
Third match. Not much to say here, other than to practice your edge spikes, and practice Fairing Fox while he's recovering. I was also puzzled why you didn't jump and Uair of Nair Fox on his last life after the throw, but rather air dodged. Other than that...your opponent got wrecked.
Fourth match. Seems you have a bit of trouble with Doctor Mario. You seem to like to back throw him, which is a laggy throw and lets him jump after the DI. At low percents, up throw and let him feel the tilts and Uairs. Against pills (you were doing this well early, but a mistake cost you a lot of damage, so just work on it), Fair them if you see you can't get punished for it, or jump back and wait for a hole to charge in and slash or throw. If you want to play a patience game, Fair them and DI back or just jump back or wavedash away until he gets in close, then punish him. Other than that, work on your shield throw spacing. You messed up a few times with it.
Also, wavedashing away is always a better option than trying to roll behind them.
Finally, you seemed addicted to doing Dair against Doc. Add some more Nairs into your game or you'll get predictable in the air.
All in all you did well. Just work on those things.
Against Falcon, Dair to Knee is pretty hard to get out of. It has a habit of making you stick in the air to get kneed. I would say either avoid getting hit entirely or if you know you can't avoid, jump, get hit into the ground and tech or roll appropriately. The best DI I would say depends on the stage and where you are, but don't DI down from the hit. You'll hover and get kneed. A good option is to try and DI behind them.
Well, that's it from me. Good smashing.
Andrew