Personally, still believe that Harrison can make his big breakthrough. Have decided to start using this site more, and seeing as Harrison is my avatar and all I decided to chime in on the some of the previous comments. Honestly, didn't realize that some people have given up on Harrison when he's still so young. I wrote an article this spring for Tennis Alternative about the upcoming generation http://www.tennisalternative.com/you...e--rn2320.html
Unfortunately, the chart listing the players and their ages when they won an ATP match, challengers title, and futures title is not there anymore. But Harrison was the youngest out of the ATP current contenders that include that likes of Janowicz, Dimitrov, and Raonic to get a futures title, challenger title, and ATP tour match. If that's not promising that I don't know what is. I mean he won his first ATP match just shy of 16 years old, Janowicz for example didn't win an ATP match until he was 21!! And, even though he's struggling he's still in the top 10 of players 21 and younger. It's not like there are a bunch of players around his age that are better than him, which makes one think that future is still bright for him. On top of that, he has multitudes of experience over most players his age, he's played many of top guy's on tour along with all of the top Americans, many more than twice. Someday he will be able to pull off the upset, he's still learning! Each time he gets a bad draw, which is often, I like to look at the bright side. I realize that with those bad draws he's playing some of the best guy's on tour, and learning with every match. It will take take, but Harrison will be back in the top 50!