Start the match by back-dashing. Since Tager is freakin slow, you can use the time away from him (unless he tries approaching you) to charge up a spark ball. I'd suggest comboing into using it instead of just throwing it out there unless you know the other guy is going to try walking up to you (which he probably won't). Also if you knock them down, Jump!. There are many people online that always fall for Genesic Emerald Tager Buster or Gigantic Tager Driver upon wake up roll and you can always punish with Arm Slam, or something less punishable if they aren't going to do it. Try to get them into a corner cause if they're on the ground knocked down, you can hold out a Genesic Emerald Tager Buster and wait for them to get up, but it's techable. Leave enough room so that if they try to roll left or right, they'll get caught either way and they won't be able to roll behind you (better with Magnetism).