The Terran versus Terran mirror match-up has always had a wide range of potential openings and early-game play styles, from gas first aggression to fast expansions, a lot of things can work out in TvT. The Reaper-Hellion opening was initially a Wings of Liberty build which involved an early Medivac to attack from inside your opponents main base. In Heart of the Swarm the build saw some use as well as a way to open with strong map control and pressure, with a later command center.
This guide looks at a build which TY used multiple times at the recent DreamHack which has a strong synergy with the current meta-game. By taking fast three command centers but opening with a defensive Cyclone and Siege Tanks, TY is able to comfortably move into the mid-game while swatting away most aggression aimed towards him. Once into the mid-game the Siege Tanks create an extra layer of defense, which you can work with in order to fend off attacks while harassing and moving into your late-game army composition of Liberator-Ghost.
The Terran versus Zerg match-up has always been my favorite throughout my time in Starcraft 2, so it only made sense for my first guide to be based on an opening which involves one of my new favorite units in the match-up : the Liberator! The Liberator brings a new way in which Terran players can play aggressively in the early-game of TvZ.