Given that I live in Europe, with the time difference, it is impossible for me to see night games live. However, this morning I have seen the condensed game summary MLB.com offers.
After having played the game since the mid 70's and being a coach for more than 25 years, I saw Bello go through something I have seen hundreds of times with young, inexperienced pitchers: he came unravelled.
Granted, he did not seem to be very sharp in the first couple of innings and was lucky enough to have some hard hit balls caught by his teammates (see the sharp line drive to 1B, which ended up being a double play!). He was obviously very well aware of the fact that he wasn't having a very good outing, although he had not given up a run in the first two innings. And this is something that lingers in the back of a pitcher's mind.
Unfortunately, he started off the third inning by giving up a double, then he had to endure two straight poor defensive plays which should have been outs (a solid 3B would not have fumbled the weak bunt, and a good defensive 2B should have fielded the ground ball, which in addition Abreu ended up airmailing to the dugout). These three consecutive plays obviously affected Bello's confidence. And here comes the moment of truth. Successful pitchers are capable of overcoming these adversities, but inexperienced ones end up suffering a long rally.
After those plays, the pitching coach should have gone to the mound to make sure his pitcher was focused on the next hitter. Again, since I did not see the game, I am not aware if this took place or not. If not, this is a mistake committed by the coaching staff.
Obviously, Bello was not focused at that moment and this caused him to walk the next two hitters. It was a snowball effect after that. And it cost the Sox a 7 run inning, and ultimately the game.
With experience, a pitcher is able to "flush" all negative thoughts from his mind after the hard hit double and two consecutive errors, although it is no easy task.
This is something Breslow and Bailey will have to work with Bello: mental fortitude.
Will they be able to help Bello overcome these mental lapses? I certainly hope so, and being the optimist that I am, I believe they will, but it will take time, effort, and renewed self-confidence.