It's pathetic to watch this poor sport turn his head away while shaking hands every time he looses. Tell me somebody here agrees.
Has it ever occurred to you that not all cultures practice handshakes? While Dennis and the rest of the Filipinos know enough to shake the hands of their opponents, they're probably not too aware of the other, finer, requisites that go with the gesture, e.g. firm grip, eye contact, a little small talk or offer of congratulations, etc. etc.
In some Asian cultures, looking at somebody in the eye is considered rude at best, or worse, insulting. In some instances, it could even get you killed. In other countries, not meeting someone's gaze is a sign of humility or of acceptance of the other's superiority or position in society or station in life.
Of course, most of the Filipino players know this but the other fine intricacies of shaking hands (who initiates, how many pumps, does one stop in their tracks, how high should it be, etc.) may escape them as it might not necessarily be in their nature, or culture, to do so.
Among the Filipino players, I think it is Francisco Bustamante who does the handshake the best (he approaches the other player, offers his hand, shakes it a few times, smiles and talks a bit to his opponent while maintaining eye contact, etc) but this might be because he spent a few years in a Western country (Germany) and learned a few things.