The ATP ranking tells us that Dominic Thiem is better at the moment, he is 6 points higher on the 4th.
The Austrian youngster is not in an exceptional form, but he showed quite well in the first game of this tournament, with Bulgarian Dimitrov, being defeated very hard in 3 sets, the score in the decisive set being 7-5.
Pablo Carreno-Busta crosses an even worse time than his opponent and has no less than 6 defeats in the last 7 games, managing to win only a modest player, Guido Pella, 64th place in the world at the moment.
If we look at the direct meetings between the two, we will notice that Thiem was forced into 5 out of six, the only defeat coming somewhere early in his career.

Tip for Pablo Carreno-Busta – Dominic Thiem :

-Dominic Thiem win @ 1.30