Since time immemorial long Sen has been the King of Taiwan. He's been around since 2004, when he won first place in WCG Taiwan. He's represented his home country and is still accounted as one of the legends of the foreigner BW community as one of its best players and this reputation has continued on into his SC2 career as he's had numerous high placing results in all 4 years of SC2 culminating to his victory at the Taiwan Open (The only foreigner to do so in the last 2 years). The strangest thing about Sen is that he marches to his own beat. He has his own ideas about the game that seems to run counter to what the rest of the world is doing at any given moment. When others are using muta ling/bling he's going roach bane. When everyone else is going roach hydra viper, he's using mass muta ling bling. He plays intuitively while relying on strong injects and decisive actions to win his games. And while the outside world seem to forget that he is the only thing that stood between the foreigner world being all killed two years in a row, in Taiwan he is their King.
If Sen is the King of Taiwan, Ian may well be the prince. He has been playing professionally since the latter half of 2012 and has slowly been gaining skill and experience and has now gotten to the point that he is considered one of the best local players of Taiwan and has reached numerous high placings in their regional circuit TesL. Beyond that not much is known about him except he has fairly strong ZvZ (Though he has only ever taken one series in the eight he's had against Sen. Much like State, he moved to Korea to become a stronger player and has been practicing in the ST house. And while practicing in Korea always improves a player, most agree that it takes a long time for the effects of said training regime to kick in.
Given the history between the two I'm going to favor Sen here. He has the experience, he has the numbers, and he's proven that when he's at his best he is a threat to any tournament he enters. At the same time Sen is also infamous for not practicing much so Ian has a bigger chance of an upset here than most people would assume.
VODs speak louder than preview articles, and this could not be more true for Has.
Just look at this game.
And this game.
Proxy oracle into proxy voidray into proxy tempest cannon contain with a nexus. Against MMA. Seriously. He wins against pros with strategies that we can't even win with against silver players. It's disgusting. It's beautiful. It's Has.
As the consensus 3rd best player in Taiwan, he was fortunate not to end up facing Sen, who he has historically been bad against. With a bronze at Taiwan Open and a bunch of semi finals finishes at TeSL and ECL, Has is one of the most accomplished Taiwanese players plying his trade in WCS AM. But all that matters to us is that Has keeps playing like Has.
On the other hand the only thing we know about Rex is that he's a Wayi Spider zerg that really really likes swarm hosts. But he's not going to reach swarm hosts. His 40% win rate in ZvP is his best matchup, and he's facing the devil. RIP