This is a really entertaining match. Chung looked invincible right up until 6-4 2-0, and then Sandgren figured something out and has been chipping away. Was serving for the 2nd set but got broken, Chung now serving to go to a tiebreak.
This is my first time watching him, and you gotta love Sandgren's story, redneck or not. College star, hit the pros, and just took it on the chin year after year. They showed that he'd made $438k over the course of his career up to this point, across 5 years of play. With all the travel, coaching, etc he's probably banked negative dollars, would have made more money teaching tennis than playing it. They said he finally qualified to the main draw of an ATP event last year in Houston, on his fifteenth try.
Well, he plays challenger event after challenger event, finally gets himself inside the top 100, gets in the main draw of a grand slam, and proceeds to take out Wawrinka and Thiem as he storms to the QFs. He's now guaranteed himself $350k from this tournament, $700k+ if he can win the match with Chung.